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Analysis of dynamical response to large deformation of piles with initial displacements 认领 引用
1
作者 胡育佳 朱媛媛 朱正佑 《Journal of Shanghai University(English Edition)》 2009年第3期233-241,共9页
In this paper, a nonlinear mathematical model for analyzing dynamical response to the large deformation of piles with initial displacements is firstly established with the arc-coordinate, and it is a set of nonlinear ... In this paper, a nonlinear mathematical model for analyzing dynamical response to the large deformation of piles with initial displacements is firstly established with the arc-coordinate, and it is a set of nonlinear integral-differential equa- tions, in which, the Winkeler model is used to simulate the resistance of the soil to the pile. Secondly, a set of new auxiliary functions are introduced. The differential-integral equations are transformed into a set of nonlinear differential equations, and the differential quadrature method （DQM） and the finite difference method （FDM） are applied to discretize the set of nonlinear equations in the spatial and time domains, respectively. Then, the Newton-Raphson method is used to solve the set of discretization algebraic equations at each time step. Finally, numerical examples are presented, and the dynamical re- sponses to the deformation of piles, including configuration, bending moment and shear force, are graphically illuminated. In calculation, two types of initial displacements and dynamical loads are applied, and the effects of parameters on the dynamical responses of piles are analyzed in detail. 展开更多
关键词 pile large deformation nonlinear dynamical response initial displacement auxiliary function differential quadrature method
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BOUNDARY ELEMENT METHOD FOR SOLVING DYNAMICAL RESPONSE OF VISCOELASTIC THIN PLATE(Ⅱ)──THEORETICAL ANALYSIS 认领 引用 被引量：2
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作者 丁睿 朱正佑 程昌钧 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1998年第2期101-110,共10页
In this paper, the necessary theoretical analysis for the approximation boundary element method to solve dynamical response of viscoelastic thin plate presented in [1] is.discussed. The theorem of existence and unique... In this paper, the necessary theoretical analysis for the approximation boundary element method to solve dynamical response of viscoelastic thin plate presented in [1] is.discussed. The theorem of existence and uniqueness of the approximate solution andthe error estimation are also obtained. Based on these conclusions , the principle forchoosing the mesh size and the number of truncated terms in the fundamental solution are given. It isshown that the theoretical ana analysis in this paper are consistent with thenumerical results in [1]. 展开更多
关键词 dynamic response viscoelasticity approximate boundary elementmethod error estimation
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BOUNDARY ELEMENT METHOD FOR SOLVING DYNAMICAL RESPONSE OF VISCOELASTIC THIN PLATE(I) 认领 引用 被引量：1
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作者 丁睿 朱正佑 程昌钧 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1997年第3期229-235,共7页
In this paper, a boundary element method for solving dynamical response of viscoelastic thin plate is given. In Laplace domain, we propose two methods to approximate the fundamental solution and develop the correspond... In this paper, a boundary element method for solving dynamical response of viscoelastic thin plate is given. In Laplace domain, we propose two methods to approximate the fundamental solution and develop the corresponding boundary element method. Then using the improved Bellman's numerical inversion of the Laplace transform, the solution of the original problem is obtained. The numerical results show that this method has higher accuracy and faster convergence. 展开更多
关键词 dynamic response viscoelasticity BEM
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Sensitivity analysis of vibration characteristics and dynamic responses of a tracked vehicle 认领 引用 被引量：1
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作者 Xun Wang Xue Rui +3 位作者 Jinghong Wang Xiaoting Rui Guoping Wang Pingxin Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第3期323-348,共26页
This study aims to establish an integrated sensitivity analysis framework for optimization and design of the dynamic performance of mechanical systems such as tracked vehicles,by combining the direct differentiation m... This study aims to establish an integrated sensitivity analysis framework for optimization and design of the dynamic performance of mechanical systems such as tracked vehicles,by combining the direct differentiation method(DDM)with the linear multibody system transfer matrix method(linear MSTMM).The rigid-flexible coupled multibody system dynamics model of a tracked vehicle is established using the linear MSTMM and validated through the modal test.Building upon the existing DDM-based eigenvalue sensitivity analysis method within the linear MSTMM,the DDM is embedded into it to enable programmable and efficient computation of dynamic response sensitivities for mechanical systems.The proposed approach is used to quantitatively evaluate the sensitivities of both natural vibration characteristics(e.g.,natural frequencies and mode shapes)and transient dynamic responses of the tracked vehicle with respect to system parameters,successfully identifying critical structural parameters.Compared to conventional finite difference methods,the developed methodology eliminates sensitivity to perturbation step sizes.The contributions of this work lie in establishing a unified theoretical foundation and analysis framework for guiding dynamics optimization and design of mechanical systems,and extending the applicability of the linear MSTMM to sensitivity analysis of transient dynamic responses. 展开更多
关键词 Tracked vehicle Sensitivity analysis Vibration characteristics Dynamic responses Direct differentiation method Linear multibody system transfer matrix method
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Dynamic response analysis of the liquid-filled cylindrical shell under internal explosion load 认领 引用
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作者 Dian Li Zhenghan Chen +3 位作者 Zhujie Zhao Yongqing Li Hailiang Hou Wenxiao Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第4期357-373,共17页
This study theoretically explored the dynamic response of the liquid-filled cylindrical shell structure experiencing internal explosion shock waves.It analyzed the radial deformation of the liquid-filled cylindrical s... This study theoretically explored the dynamic response of the liquid-filled cylindrical shell structure experiencing internal explosion shock waves.It analyzed the radial deformation of the liquid-filled cylindrical shell structure theoretically.It clarified the protection mechanism of the externally liquid-filled cylindrical shell structure.Based on the improved single-degree-of-freedom system theory,a theoretical model was established via load equivalence and simplification.The radial deformations of unfilled and externally liquid-filled cylindrical shells was investigated under internal explosion shock waves.The influencing factors for structural protection characteristics were explored considering impact load intensity,liquid layer thickness,structural specifications and dimensions,and material properties.The results showed that when the load peak value or the action time was fixed,the maximum radial deformation of the structure increased with the increased load-specific impulse.When the load-specific impulse was fixed,reducing the load peak or extending the loading time decreased the maximum radial deformation of the structure.The protection mechanism of the externally liquid-filled cylindrical shell structure was due to the liquid medium,which acted as an additional mass that con-strained the radial deformation of the structure.The change in liquid layer thickness altered the duration of the liquid's constraint on the radial deformation.The dynamic response of the externally liquid-filled cylindrical shell structure presented three deformation modes,which were determined by the liquid layer thickness,structural specifications,dimensions,and material properties. 展开更多
关键词 SDOF analysis Load equivalence and simplification method Liquid-filled structure Dynamic response Internal explosion load
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Dynamic responses of Dagangshan high-arch dam under Luding earthquake:Insights from microseismic monitoring and digital twin model 认领 引用
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作者 Ke Ma Yusheng Tang +2 位作者 Fuqiang Ren Zhaohu Yuan Zhiliang Gao 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第2期986-1001,共16页
The integration of digital twin(DT)technology with microseismic(MS)monitoring for evaluating the dynamic response of high-arch dams remains under-explored.This paper investigates the application of MS monitoring on th... The integration of digital twin(DT)technology with microseismic(MS)monitoring for evaluating the dynamic response of high-arch dams remains under-explored.This paper investigates the application of MS monitoring on the Dagangshan high-arch dam during its normal water storage operating period to assess potential damage.The study analyzes the MS characteristics of the dam during the Luding earthquake(Ms=6.8).A framework for constructing a damage driven DT model of a high-arch dam is proposed.The DT model is capable of self-updating its mechanical parameters based on MS data.Seismic response calculations are conducted utilizing cloud computing,allowing for the direct presentation of results within the DT model.The results indicate a high-risk area of the Dagangshan arch dam,characterized by significantMS deformation,primarily centered on the arch crown beam.This zone encompasses dam sections Nos.5-6,10-11,13-16,and 19-20,all located above 1030 m elevation.Under seismic loading,the arch dam exhibits a back-and-forth movement along the river,ultimately reaching a stable state.Following the earthquake,the stress state of the dam does not experience substantial changes.The average relative error between numerical results and measured peak ground acceleration values is 17%when considering the cumulative effect of damage,compared to 36%when neglecting this effect.This study presents a more reliable approach for assessing the state of dams. 展开更多
关键词 High-arch dam Dynamic responses Microseismic(MS)monitoring Digital twins(DTs) Luding earthquake
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A unified analytical model for track deformation mapping and vehicle-track dynamic response induced by substructure deformation 认领 引用
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作者 CHEN Yao FENG Qing-song +2 位作者 ZHAO Lei ZHANG Ling YANG Zhou 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第4期1885-1900,共16页
This study establishes a nonlinear vehicle-track coupled dynamic model that explicitly accounts for the effects of substructure deformation.Based on the vehicle-track coupled dynamics framework,the track structure is ... This study establishes a nonlinear vehicle-track coupled dynamic model that explicitly accounts for the effects of substructure deformation.Based on the vehicle-track coupled dynamics framework,the track structure is modeled using an energy-based approach,in which displacement functions of track layers are expanded into modified Fourier series.The static rail geometry and interlayer contact relations are derived through the principle of stationary potential energy.Considering the dynamic excitation from moving trains,a cross-iterative algorithm is employed to obtain the system responses,thereby enabling unified analysis of static track deformation and dynamic vehicle-track interactions.The results demonstrate that the proposed model effectively reveals the coupling mechanism between substructure deformation parameters,rail surface geometry,and system dynamics.The critical conditions for avoiding void formation under cosine-type and angular-type subgrade settlements follow power-law and linear relations,respectively.For a cosine-type settlement with a wavelength of 15 m and amplitude exceeding 35 mm,vehicle ride quality deteriorates significantly.Moreover,interlayer separation induced by substructure deformation leads to repeated"contact-separation recontact"impacts,which may degrade long-term structural performance.This study provides a unified theoretical and computational framework for quantitatively assessing the effects of substructure deformation on high-speed train safety and track structure durability. 展开更多
关键词 high-speed railway substructure deformation energy method voids between layers mapping relationship dynamic responses
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Analytical solutions on dynamic response of a thin-walled curved beam subjected to two-axle moving load with variable speed 认领 引用
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作者 Xiaoyong Lv Liupeng Li +1 位作者 Zhiwu Yu Peng Liu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第2期237-251,共15页
This paper proposes the analytical solutions involving damping effects for the dynamic response of a simply supported thin-walled curved beam under uniformly variable two-axle moving loads in four directions:vertical,... This paper proposes the analytical solutions involving damping effects for the dynamic response of a simply supported thin-walled curved beam under uniformly variable two-axle moving loads in four directions:vertical,torsional,radial,and axial.The warping stiffness and damping of the thin-walled beam were comprehensively considered in the vibration control equations.Unlike traditional one-axle load cases,this study employs a more realistic two-axle vehicle load model.Based on the modal superposition method,the control vibration equations for thin-walled curved beams in-plane and out-ofplane under variable speed moving loads were solved using a combination of the Fourier sine transform method,the Galerkin method,and the Laplace transform method.Analytical solutions for the dynamic responses were derived in integral form,facilitating direct numerical computation.The proposed computational method’s effectiveness and accuracy were validated against published research.Subsequently,the dynamic responses of the thin-walled curved beam under one-axle and two-axle moving load models were compared,and the effects of initial load velocity,load acceleration,and center angle of the curved beam on the dynamic responses were investigated through extensive parameter research.The research results provide valuable insights into the structural behavior of thin-walled curved beams under the moving loading with variable speed. 展开更多
关键词 Thin-walled curved beam Dynamic response Variable speed Two-axle moving load Analytical solution
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Dynamic response and stability of gob-side entry retaining under blasting roof cutting 认领 引用
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作者 HAN Jihuan WU Qing +3 位作者 LIU Changan WANG Jing HUANG Zhixiang KONG Hailong 《Journal of Mountain Science》 SCIE CSCD 2026年第7期3429-3440,共12页
In gob-side entry retaining,directional blasting is commonly used to pre-split hard roofs.However,the blasting impact often causes severe dynamic damage to the surrounding rock and filling walls.To investigate the dyn... In gob-side entry retaining,directional blasting is commonly used to pre-split hard roofs.However,the blasting impact often causes severe dynamic damage to the surrounding rock and filling walls.To investigate the dynamic response and stability of entry retaining under blasting roof cutting,a numerical model was established using Livermore Software Dynamics based on the geological conditions of the Daxing Coal Mine.The Johnson-Holmquist dynamic constitutive model was introduced to simulate the non-linear damage behavior of the rocks under explosive loads.The results show that the blasting disturbance significantly affects the roadway roof and filling wall,with the maximum roof displacement reaching 3.26 cm and a maximum tensile stress of 9.42 MPa generated at the upper part of the filling wall.Notably,the damage degree of the filling wall exhibits an exponential decay trend as the horizontal roof-cutting distance increases.Furthermore,a joint analysis combining the dynamic blasting disturbance and the static overlying strata pressure indicates that the combined stress on the filling wall reaches a minimum of 0.149 MPa at a horizontal cutting distance of 7 m.Therefore,7 m is determined as the optimal roof-cutting distance.The findings provide a quantitative reference for the stability control of gob-side entry retaining under hard roof conditions. 展开更多
关键词 Gob Side Entry Retaining Blasting roof cutting Dynamic constitutive model Dynamic response Hard roof Livermore Software Dynamics
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Spatial dynamic response of aeolian sand subgrade reinforced by geocell 认领 引用
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作者 LIU Jie LIU Qinli +3 位作者 LIU Xuejun LI Kaiqiang HU Changtao AI Yuhao 《水利水电技术（中英文）》 CSCD 北大核心 2026年第4期187-201,共15页
[Objective]The spatial dynamic response of a new desert highway subgrade structure by geocell reinforcement with aeolian sand is studied.[Methods]Based on the dynamic triaxial test,a field test via monitoring the resp... [Objective]The spatial dynamic response of a new desert highway subgrade structure by geocell reinforcement with aeolian sand is studied.[Methods]Based on the dynamic triaxial test,a field test via monitoring the response acceleration change is carried out.The attenuation law and dynamic response range of the response acceleration along the depth and horizontal directions of the subgrade are obtained for the geocell-reinforced subgrade structure.The mechanism of dynamic response of geocell-reinforced materials to aeolian sand subgrade is further discussed.[Results]The result show that both vehicle load and vehicle speed have a great influence on the response acceleration of the new aeolian sand subgrade.The response acceleration shows a nonlinear attenuation in the depth direction,and the attenuation rate gradually slows down with increasing depth.Meantime,the horizontal direction shows a variation of exponential decay.Therefore,an attenuation prediction model of response acceleration along the horizontal direction of aeolian sand subgrade is established.[Conclusion]Based on this field test condition,the most dominant dynamic response region of the subgrade is in a range of 1.2 m in depth and 2.5 m in horizontal.The reinforcement effect of geocell on aeolian sand increases the confining pressure level,and restricts the lateral displacement of soil.In addition,the generation of shear bands in the soil is inhibited by the reinforcement effect.This makes the energy dissipation of the subgrade soil more obvious. 展开更多
关键词 subgrade engineering geocell aeolian sand large-scale triaxial test spatial dynamic response dynamic triaxial test field test influencing factors
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Dynamic immune response and its influencing factors in COVID-19 patients with non-alcoholic fatty liver disease:A cohort study 认领 引用 被引量：1
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作者 Pan Yan Rui Li +4 位作者 Xiao-Yan Yuan Yong Wang Li-Juan Lan Xiao-Ping Yu Da-Feng Liu 《World Journal of Hepatology》 2026年第2期101-125,共25页
BACKGROUND Dynamic alterations in lymphocyte subsets demonstrate significant correlations with clinical disease severity in patients with coronavirus disease 2019(COVID-19).As the most prevalent chronic liver disease ... BACKGROUND Dynamic alterations in lymphocyte subsets demonstrate significant correlations with clinical disease severity in patients with coronavirus disease 2019(COVID-19).As the most prevalent chronic liver disease globally,non-alcoholic fatty liver disease(NAFLD)exhibits distinct chronic inflammatory and immunometabolic disturbances that may substantially affect immune response patterns in COVID-19 patients.Nevertheless,the characteristics of lymphocyte subset dynamics and their clinical implications in COVID-19-NAFLD remain to be fully elucidated.AIM To characterize the dynamic changes in lymphocyte subsets among COVID-19 patients with NAFLD,in order to delineate their immunological profiles and inform clinical management strategies.METHODS The cohort study compared lymphocyte subpopulations in 858 COVID-19 patients and 670 COVID-19-NAFLD patients at admission,discharge,and 2-week/4-week post-discharge follow-ups.RESULTS Compared to COVID-19 patients without NAFLD,NAFLD-comorbid patients demonstrated persistently elevated CD3+CD4+counts as well as lymphocyte counts and percentages at admission and at the 2-week and 4-week follow-ups post-discharge(all P<0.05).Among COVID-19-NAFLD patients,those aged≥60 years had significantly lower CD3+counts,CD3+CD4+counts,CD3+CD8+counts,lymphocyte counts and percentages,and CD19+counts and percentages at all assessed time points(all P<0.05);significant liver fibrosis correlated with reduced CD3+CD4+counts,CD3+CD8+counts,and lymphocyte counts and percentages across all time points(all P<0.05);multimorbidity(≥3 comorbidities)exacerbated immune imbalance,marked by elevated CD3+CD4+percentages and CD56+counts at admission,increased CD3+CD4+counts,lymphocyte counts,and CD19+counts and percentages at discharge,as well as sustained increases in CD3+CD4+counts at the 2-week follow-up and higher CD3+CD4+percentages at the 4-week post-discharge follow-up(all P<0.05);and obesity and elevated liver enzymes were independently linked to higher CD3+CD4+counts,CD19+counts,and lymphocyte counts at all post-admission evaluations(from discharge through the 4-week follow-up)(all P<0.05).CONCLUSION Age,liver fibrosis,comorbidities,obesity,liver enzyme abnormalities,vaccination status,low-density lipoprotein cholesterol,and hemoglobin A1c significantly modulate immune responses in COVID-19-NAFLD patients,warranting targeted clinical attention.Furthermore,patients with uncomplicated NAFLD(including lean NAFLD)also require particular clinical attention to mitigate risks of immune imbalance. 展开更多
关键词 COVID-19 Non-alcoholic fatty liver disease Lymphocyte subsets Dynamic immune response Risk factors
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Dynamic response of RC columns under off-central explosions:Experimental,theoretical studies and neural network prediction 认领 引用
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作者 Hao Wang Xiangyu Li +2 位作者 Yong Peng Zhandong Tian Fangyun Lu 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第2期314-336,共23页
Reinforced concrete(RC)columns are often subjected to off-central explosion due to the uncertainty of blast locations.However,few studies have focused on the dynamic response of RC columns under offcentral explosions.... Reinforced concrete(RC)columns are often subjected to off-central explosion due to the uncertainty of blast locations.However,few studies have focused on the dynamic response of RC columns under offcentral explosions.A field blast experiment was conducted under close-in explosion with varying detonation offset distances(0 m,0.5 m,and 1 m),the overpressure load and dynamic responses of the full-scale RC columns were measured.Compared with the centrally detonated condition,a relative offset distance of 1.67 decreases the maximum and residual deflections of the RC column by 16.8%and 21.4%,respectively,while increasing the maximum and residual support rotations by 24.7%and 17.8%.Based on the experimental results,a theoretical model was proposed that considers the detonation location and charge mass,boundary conditions,axial compression ratio and material properties.The theoretical model exhibited good agreement with the experimental results,with prediction errors below 10%for both maximum and residual deflection.The effects of parameters were analyzed,and it indicated that an increase in offset distance results in decreased maximum and residual deflections but an increased support angle,thereby exacerbating damage.Higher axial load ratio,span-depth ratio,and longitudinal reinforcement ratio reduce both deflections and support angle.Additionally,a rapid method to predict the maximum and residual deflection of RC columns under off-central blast loading was also proposed based on the Generalized Regression Neural Network(GRNN).Eleven features which related to the RC column properties and the blast characteristics were used in the training process of GRNN,and accurate predictions were achieved with prediction errors within 20%.This study fills the gap in predicting the dynamic response of RC columns under off-central explosion,providing valuable references for blast-resistant design. 展开更多
关键词 Dynamic responses RC columns Off-central explosions Theoretical model GRNN
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Dynamic response and long-term effects of tunnels in expansive mudstone under high-speed train loading 认领 引用
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作者 HE Tianzi LI Bin +3 位作者 ZHANG Huijian CHEN Wei XIA Zengyin LIU Gongning 《Journal of Mountain Science》 SCIE CSCD 2026年第5期2347-2368,共22页
Expansive mudstone is highly susceptible to swelling upon water exposure,leading to significant deformation and localized stress concentration in tunnel linings.The periodic dynamic loads induced by high-speed trains ... Expansive mudstone is highly susceptible to swelling upon water exposure,leading to significant deformation and localized stress concentration in tunnel linings.The periodic dynamic loads induced by high-speed trains further exacerbate these adverse effects,thereby compromising the operational safety of the tunnel.However,existing research on the dynamic response of high-speed trains in tunnels predominantly focuses on non-expansive rock formations.Studies addressing vehicle-induced vibration in expansive rock strata remain comparatively scarce,especially lacking exploration of local surrounding rock expansion which may cause more unfavorable stress concentration.A vehicletrack-tunnel dynamic calculation model was developed based on a high-speed railway tunnel traversing expansive mudstone strata.This model analyzed the dynamic response variations in the tunnel lining under moving train load when expansive deformation occurred at different locations in the surrounding mudstone rock(i.e.,vault,sidewall,or invert).Subsequently,the fatigue life and long-term settlement(LTS)patterns of the tunnel were predicted under various expansion conditions.The results show that when the surrounding rock at the vault,sidewall,or invert expands,the respective maximum principal stresses(MAPS)of lining are 5.03 MPa,7.24 MPa,and 0.86 MPa,respectively,and the respective peak minimum principal stresses(MIPS)are-10.33 MPa,-10.80 MPa,and-5.52 MPa,respectively.The MAPS exceeds the safety threshold when the surrounding mudstone rock at vault or sidewall expands.Moreover,the fatigue life of the lining under different expansion conditions follows the order:no expansion>the surrounding rock expansion at invert>the surrounding rock expansion at vault>the surrounding rock expansion at sidewall.The predicted fatigue life of the lining indicates that local expansion of the surrounding mudstone induces significant stress concentration in the lining,thereby shortening its service life.Furthermore,the LTS prediction shows that after 100 years of operation,the LTS at the tunnel base under the conditions of no expansion,the surrounding rock expansion at vault,the surrounding rock expansion at sidewall,and the surrounding rock expansion at invert are 8.43 mm,13.01 mm,11.24 mm,and 6.38 mm,respectively.Notably,the LTS caused by surrounding rock expansion at invert is lower than that under other conditions because such deformation partially offsets the settlement induced by train load.These findings offer critical insights for the design and maintenance of similar tunnels in expansive mudstone strata. 展开更多
关键词 Expansive mudstone Train vibration load Dynamic response Fatigue life Long term settlement
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P-wave scattering and dynamic response of shaft linings subjected to inhomogeneous in-situ stress 认领 引用
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作者 YU Meng-fei WU Chun-ping +4 位作者 XU Ze-hui CUI Xin-nan JIA Yong-sheng ZHANG Guang-quan LUO Bin-yu 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第6期2703-2720,共18页
In the complex stress environment of deep underground mines,blasting disturbances are more likely to cause damage to shaft linings.To investigate the scattering of P-waves and dynamic response within a shaft lining in... In the complex stress environment of deep underground mines,blasting disturbances are more likely to cause damage to shaft linings.To investigate the scattering of P-waves and dynamic response within a shaft lining in an inhomogeneous in-situ stress field,a theoretical model for the critical peak particle velocity(PPV)of shaft linings under the combined action of non-uniform horizontal stress and incident P-waves was established based on multiple-angle method and wave function expansion method.The theory was validated using numerical simulation.The influence of key engineering parameters on the critical PPV of the shaft lining was quantitatively analyzed.Results indicate that the critical PPV of the shaft lining decreases with increasing elastic modulus of the lining and rock,as well as increasing rock density.When the shaft lining is relatively thin,the critical PPV decreases significantly.The stress non-uniformity coefficient(β)shows a significant negative correlation with the critical PPV of the shaft lining.The relationship between the in-situ stress magnitude and the critical PPV of the shaft lining changes from positive to negative asβincreases. 展开更多
关键词 shaft lining wave function expansion uneven stress dynamic response
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Research on the Competition Mechanism of Fractures in Multi-Cluster Fracturing of Horizontal Wells:Dynamic Response and Influence of Engineering Parameters 认领 引用
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作者 Pujin Wang Guofa Ji +1 位作者 Wenwei Zhao Liangping Yi 《Energy Engineering》 EI 2026年第5期195-211,共17页
In multi-cluster horizontal well fracturing,non-uniform propagation due to inter-cluster interference severely limits the effectiveness of reservoir stimulation.This study employs the discrete lattice method for numer... In multi-cluster horizontal well fracturing,non-uniform propagation due to inter-cluster interference severely limits the effectiveness of reservoir stimulation.This study employs the discrete lattice method for numerical simulation,investigating the influence of cluster spacing,fracturing fluid injection rate,and horizontal stress difference on fracture propagation morphology by monitoring,in real time,the dynamic changes in flow pressure,flow rate,and fluid intake volume for each cluster.The results indicate that the stress shadow effect is the fundamental cause of non-uniform fracture propagation.Cluster spacing is a key parameter controlling the maximum flow pressure difference between the central and edge clusters.When cluster spacing decreases from 4 to 2 m,the maximum flow pressure difference increases by 7.32 MPa,while the fluid intake volume decreases by nearly three times.Increasing the injection rate of the fracturing fluid raises the maximum fracture width from 7.35 to 15.1 mm and reduces the maximum inter-cluster flow pressure difference from 4.48 to 0.53 MPa.A reduction in the horizontal stress difference mitigates the stress shadow effect.When the horizontal stress difference decreases from 5 to 1 MPa,the maximum fracture width increases by 3.97 mm.This study elucidates the influence of various parameters on hydraulic fracturing effectiveness,providing theoretical guidance for optimizing fracturing parameters in fracture-propagation design. 展开更多
关键词 Horizontal well fracture competition numerical simulation multi-cluster fracturing dynamic response
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Computational and Experimental Modeling of Curved Crack Effects on the Dynamic Response of Plate Structures 认领 引用
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作者 Yousef Lafi A.Alshammari Muhammad Khan Hilal Doganay Kati 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第4期252-278,共27页
Cracks can severely degrade the integrity and service performance of plate structures.Although most existing studies focus on identifying straight crack patterns using dynamic response data,curved crack paths have rec... Cracks can severely degrade the integrity and service performance of plate structures.Although most existing studies focus on identifying straight crack patterns using dynamic response data,curved crack paths have received far less attention,despite being more realistic in practice and having a stronger influence on structural behaviour.This study presents a computational and experimental framework for analyzing and identifying curved crack paths in cantilever plate structures based on dynamic response characteristics.Curved crack paths are modelled using second-order polynomial equations.Finite Element Analysis(FEA)is employed to evaluate the effects of polynomial coefficients and crack end abscissa(xend)on natural frequency and resonance amplitude,while experimental modal analysis(EMA)on damping ratio.Forward and inverse identification models are then developed using linear regression(LR)and artificial neural networks(ANN)to predict dynamic response characteristics and estimate crack path.Results show that the quadratic coefficient(a)and linear coefficient(b)of the crack path have the most decisive influence on the plate’s vibration characteristics,whereas the constant term(c)has a negligible effect.Also,the crack paths with greater curvature and inclination,represented by higher a and b coefficients,especially at smaller end abscissae(xend),tend to reduce natural frequencies and increase vibration amplitudes and damping ratios.In contrast,smoother,less curved cracks exhibit the opposite behaviour.These curved crack geometries cause greater stiffness degradation by altering both axial and shear stiffness.Consequently,local flexibility and energy dissipation increase due to enhanced crack-surface interaction and localised deformation.The proposed computational models are experimentally validated using 15 fabricated plates with different curved crack profiles,demonstrating high prediction accuracy.Overall,the study enhances the computational identification and characterization of curved cracks in plate structures,contributing to improved damage assessment and structural health monitoring(SHM)based on dynamic response. 展开更多
关键词 Curved crack paths computational modeling dynamic response analysis finite element analysis(FEA) artificial neural networks
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Dynamic responses of steep bedding slope-tunnel system under coupled rainfall-seismicity:Shaking table test 认领 引用 被引量：4
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作者 Wanpeng Shi Jianwei Zhang +3 位作者 Danqing Song Xiaoli Liu Enzhi Wang Jianmin Zhang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2025年第4期2072-2090,共19页
The coupling effects of rainfall,earthquake,and complex topographic and geological conditions complicate the dynamic responses and disasters of slope-tunnel systems.For this,the large-scale shaking table tests were ca... The coupling effects of rainfall,earthquake,and complex topographic and geological conditions complicate the dynamic responses and disasters of slope-tunnel systems.For this,the large-scale shaking table tests were carried out to explore the dynamic responses of steep bedding slope-tunnel system under the coupling effect of rainfall and earthquake.Results show that the slope surface and elevation amplification effect exhibit pronounced nonlinear change caused by the tunnel and weak interlayers.When seismic wave propagates to tunnels,the weak interlayers and rock intersecting areas present complex wave field distribution characteristics.The dynamic responses of the slope are influenced by the frequency,amplitude,and direction of seismic waves.The acceleration amplification coefficient initially rises and then falls as increasing seismic frequency,peaking at 20 Hz.Additionally,the seismic damage process of slope is categorized into elastic(2-3 m/s2),elastoplastic(4-5 m/s2)and plastic damage stages(≥6.5 m/s2).In elastic stage,ΔMPGA(ratio of acceleration amplification factor)increases with increasing seismic intensity,without obvious strain distribution change.In plastic stage,ΔMPGA begins to gradually plummet,and the strain is mainly distributed in the damaged area.The modes of seismic damage in the slope-tunnel system are mainly of tensile failure of the weak interlayer,cracking failure of tunnel lining,formation of persistent cracks on the slope crest and waist,development and outward shearing of the sliding mass,and buckling failure at the slope foot under extrusion of the upper rock body.This study can serve as a reference for predicting the failure modes of tunnel-slope system in strong seismic regions. 展开更多
关键词 Rainfall and earthquake coupling Steep bedding slope-tunnel system Dynamic response characteristics Slope and tunnel interaction Damage evolution
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Hydrodynamic Performance and Structural Response of a Sharp Eagle Wave Energy Converter Platform Under Extreme Sea States 认领 引用 被引量：2
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作者 YUE Wan-zhen WANG Kun-lin +4 位作者 JIANG Jia-qiang SHENG Song-wei LU Wen-zhao HE Teng YANG Xian-yuan 《China Ocean Engineering》 SCIE EI CSCD 2025年第2期373-382,共10页
This paper presents a new type of triangular Sharp Eagle wave energy converter(WEC)platform.On the basis of the linear potential flow theory and the finite element analysis method,the hydrodynamic performance and stru... This paper presents a new type of triangular Sharp Eagle wave energy converter(WEC)platform.On the basis of the linear potential flow theory and the finite element analysis method,the hydrodynamic performance and structural response of the platform are studied,considering the actual platform motion and free surface rise under extreme sea states.First,the effects of the wave frequency and direction on the wave-induced loads and dynamic responses were examined.The motion at a wave direction angle of 0°is relatively low.On this basis,the angle constrained by the two sides of the Sharp Eagle floaters should be aligned with the main wave direction to avoid significant platform motion under extreme sea states.Additionally,the structural response of the platform,including the wave-absorbing floaters,is investigated.The results highlighted that the conditions or locations where yielding,buckling,and fatigue failures occur were different.In this context,the connection area of the Sharp Eagle floaters and platform is prone to yielding failure under oblique wave action,whereas the pontoon and side of the Sharp Eagle floaters are prone to buckling failure during significant vertical motion.Additionally,fatigue damage is most likely to occur at the connection between the middle column on both sides of the Sharp Eagle floaters and the pontoons.The findings of this paper revealed an intrinsic connection between wave-induced loads and the dynamic and structural responses of the platform,which provides a useful reference for the improved design of WECs. 展开更多
关键词 wave energy converter extreme sea states finite element analysis dynamic response structural response
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Dynamic Response Analyses and Experimental Research into Deep-Sea Mining Systems Based on Flexible Risers 认领 引用 被引量：2
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作者 Jianyu Xiao Zhuang Kang +3 位作者 Ming Chen Yijun Shen Yanlian Du Jing Leng 《哈尔滨工程大学学报（英文版）》 CSCD 2025年第4期789-804,共16页
The deep seabed is known for its abundant reserves of various mineral resources.Notably,the Clarion Clipperton(C-C)mining area in the northeast Pacific Ocean,where China holds exploration rights,is particularly rich i... The deep seabed is known for its abundant reserves of various mineral resources.Notably,the Clarion Clipperton(C-C)mining area in the northeast Pacific Ocean,where China holds exploration rights,is particularly rich in deep-sea polymetallic nodules.These nodules,which are nodular and unevenly distributed in seafloor sediments,have significant industrial exploitation value.Over the decades,the deep-sea mining industry has increasingly adopted systems that combine rigid and flexible risers supported by large surface mining vessels.However,current systems face economic and structural stability challenges,hindering the development of deep-sea mining technology.This paper proposes a new structural design for a deep-sea mining system based on flexible risers,validated through numerical simulations and experimental research.The system composition,function and operational characteristics are comprehensively introduced.Detailed calculations determine the production capacity of the deep-sea mining system and the dimensions of the seabed mining subsystem.Finite element numerical simulations analyze the morphological changes of flexible risers and the stress conditions at key connection points under different ocean current incident angles.Experimental research verifies the feasibility of collaborative movement between two tethered underwater devices.The proposed deep-sea mining system,utilizing flexible risers,significantly advances the establishment of a commercial deep-sea mining system.The production calculations and parameter determinations provide essential references for the system’s future detailed design.Furthermore,the finite element simulation model established in this paper provides a research basis,and the method established in this paper offers a foundation for subsequent research under more complex ocean conditions.The control strategy for the collaborative movement between two tethered underwater devices provides an effective solution for deep-sea mining control systems. 展开更多
关键词 Deep-sea mining Flexible riser Underwater mineral resources Dynamic response analyses Collaborative movement
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PFC-FDEM multi-scale cross-platform numerical simulation of thermal crack network evolution and SHTB dynamic mechanical response of rocks 认领 引用 被引量：2
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作者 Yue Zhai Shaoxu Hao +1 位作者 Shi Liu Yu Jia 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2025年第9期1555-1589,共35页
Underground engineering in extreme environments necessitates understanding rock mechanical behavior under coupled high-temperature and dynamic loading conditions.This study presents an innovative multi-scale cross-pla... Underground engineering in extreme environments necessitates understanding rock mechanical behavior under coupled high-temperature and dynamic loading conditions.This study presents an innovative multi-scale cross-platform PFC-FDEM coupling methodology that bridges microscopic thermal damage mechanisms with macroscopic dynamic fracture responses.The breakthrough coupling framework introduces:(1)bidirectional information transfer protocols enabling seamless integration between PFC’s particle-scale thermal damage characterization and FDEM’s continuum-scale fracture propagation,(2)multi-physics mapping algorithms that preserve crack network geometric invariants during scale transitions,and(3)cross-platform cohesive zone implementations for accurate SHTB dynamic loading simulation.The coupled approach reveals distinct three-stage crack evolution characteristics with temperature-dependent density following an exponential model.High-temperature exposure significantly reduces dynamic strength ratio(60%at 800℃)and diminishes strain-rate sensitivity,with dynamic increase factor decreasing from 1.0 to 2.2(25℃)to 1.0-1.3(800℃).Critically,the coupling methodology captures fundamental energy redistribution mechanisms:thermal crack networks alter elastic energy proportion from 75%to 35%while increasing fracture energy from 5%to 30%.Numerical predictions demonstrate excellent experimental agreement(±8%peak stress-strain errors),validating the PFC-FDEM coupling accuracy.This integrated framework provides essential computational tools for predicting complex thermal-mechanical rock behavior in underground engineering applications. 展开更多
关键词 Thermal geomechanics Thermo-mechanical coupling phenomena Fracture network propagation PFC-FDEM Dynamic mechanical response
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