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Research and application of mechanical models for the whole process of 110 mining method roof structural movement 认领 引用 被引量：16
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作者 BIAN Wen-hui YANG Jun +2 位作者 HE Man-chao ZHU Chun XU Dong-ming 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第9期3106-3124,共19页
For the 110 mining method,it is challenging to accurately calculate the support resistance of the roadway due to the lack of understanding of the dynamic movement of the overlying strata in this method.The consequenti... For the 110 mining method,it is challenging to accurately calculate the support resistance of the roadway due to the lack of understanding of the dynamic movement of the overlying strata in this method.The consequential excessive support results in a significant increase in the cost of roadway support.The authors explored the overlying strata movement and roadway deformation of the gob-entry retaining in the 110 mining method to solve this problem.First,the typical stages of the roof-cutting gob-side entry were defined.Second,the mechanical model and calculation formula of the support resistance on the roof were explored.Then,using numerical simulation software,the starting ranges of the specific supports at different stages were verified and the feasibility of the support scheme was examined.Finally,combined with the field measurement data,the stress and the deformation of the gob roadway at different stages under the influence of two mining processes in the 110 mining method were obtained.The numerical simulation results obtained are consistent with the field test results,providing a theoretical basis for precision support at different stages by the 110 mining method. 展开更多
关键词 110 mining method gob-side entry retaining roof structure movement mechanical model
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Multiparameter Estimation of PMSM Combining Mechanical and Electrical Models with Nonlinear Saturated Inductance and Voltage Fitting 认领 引用
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作者 Lupeng Yang Yuting Lu +1 位作者 Guodong Feng Yu Han 《CES Transactions on Electrical Machines and Systems》 EI CSCD 2026年第1期109-120,共12页
In this paper,a precise and computationally efficient method for estimating multiparameter of permanent magnet synchronous motors(PMSMs)is proposed.This method can realize decoupling estimation with a small amount of ... In this paper,a precise and computationally efficient method for estimating multiparameter of permanent magnet synchronous motors(PMSMs)is proposed.This method can realize decoupling estimation with a small amount of data at a single speed,and considers the inductance correlation to improve the estimation accuracy.The saturation in the stator frame is first modeled,and then the related inductance model in the rotating frame is derived.The estimation model is established based on the related inductance model,which is modeled by polynomials of d-axis current(Id)for a given q-axis current(Iq).Then,the influence of permanent magnet(PM)flux linkage on inductance estimation can be eliminated by using the partial derivative of the correlated inductance model.The estimation model fully explores the inductance correlation and can realize the decoupling of PM flux linkage(λ0)and inductance,which greatly improves the inductance estimation accuracy,especially when Id is small.Moreover,this paper realizes the estimation of distortion voltage,PM flux linkage,and stator resistance based on the derived electrical model and mechanical model.Compared with the existing method,this method can use a small amount of data at a single speed to model voltage,which can effectively reduce the influence of measurement noise and improve the calculation efficiency.Experimental verification on a laboratory PMSM prototype shows that the method’s performance of the proposed method is better than existing methods under various working conditions. 展开更多
关键词 Permanent magnet synchronous motors(PMSMs) Decoupling estimation Correlated inductance Partial derivative Mechanical and electrical model
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Nonlinear mechanical behavior and shell-joint modeling method in rectangular pipe-jacking tunnel joints 认领 引用
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作者 Zhengdong HUANG Youjun XU +3 位作者 Pengfei LI Chao ZHANG Yuhan SHAN Xu ZHANG 《ENGINEERING Structure and Civil Engineering》 SCIE EI CAS CSCD 2026年第4期804-827,共24页
Rectangular pipe-jacking tunnels are highly prone to longitudinal deformation under the influence of adjacent engineering activities,uneven foundation settlement,and changes in surface loads.These problems may lead to... Rectangular pipe-jacking tunnels are highly prone to longitudinal deformation under the influence of adjacent engineering activities,uneven foundation settlement,and changes in surface loads.These problems may lead to structural damage at the joints of rectangular pipe-jacking tunnels,potentially triggering engineering disasters.In response to these situations,this paper experimentally studies the effects of different foundation conditions and steel sleeve ring design parameters on their shear stiffness and rotational stiffness.It reveals three stages of joint failure:gap closure,steel sleeve ring stress,and deformation failure.A three-dimensional refined numerical simulation method is adopted to study the deformation and failure characteristics of joints under different foundation strengths and steel sleeve ring design parameters,analyze the mechanical performance of the joints of rectangular pipe-jacking tunnels,and verify the reliability of the experimental results.Based on the experimental and numerical simulation results,considering the nonlinear characteristics of the joints of rectangular pipe-jacking tunnels,a shell-joint theoretical model is constructed.Precise simulation is achieved through the combination of‘rotation+shear’dynamic elements,and the stiffness matrix at the joints and the calculation method of mechanical elements are derived.The shell-joint theoretical model is used to compare and verify the results of the joint tests of rectangular pipe-jacking tunnels,confirming the accuracy and practicality of the shell-joint theoretical model. 展开更多
关键词 rectangular pipe-jacking shell-joint mechanical model foundation stiffness longitudinal deformation
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Failure mechanism of the coal wall at the working face based on an eccentric compression mechanical model 认领 引用
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作者 Maolin Tian Jiabao Wang +4 位作者 Changsheng Wang Shijie Sun Lijun Han Qingbin Meng Sunhao Zhang 《Deep Underground Science and Engineering》 EI CAS CSCD 2026年第1期127-143,共17页
The deformation and failure of coal walls in front of a working face cause significant difficulties during mining operations.This study reveals the nonuniform distribution of bearing pressure in front of coal walls ba... The deformation and failure of coal walls in front of a working face cause significant difficulties during mining operations.This study reveals the nonuniform distribution of bearing pressure in front of coal walls based on in situ monitoring data and numerical simulation.Therefore,an eccentric compression mechanical model was established to study the deformation and failure characteristics of a coal wall.The slenderness ratio of the compression bar is introduced to define coal walls.The results showed that instability failure occurs when λ>λc and material failure occurs when λ≤λc.The instability failure-type coal wall spalling was related to the mining height,eccentricity of roof pressure,the horizontal force,and the reaction moment of the floor.The material failure-type coal wall spalling was related to the cohesion,the internal friction angle of the coal,the upper pressure,and the horizontal force of coal walls.Unstable and destructive coal wall peeling usually occurs at a height of 0.5–0.6 times the mining height,while material damage to coal wall peeling is determined to occur within the range of 0.4-0.6 times the mining depth.The findings contribute to the understanding of the deformation and failure of coal walls. 展开更多
关键词 coal wall spalling eccentric compression mechanical model failure mechanism instability failure shear failure
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Coupled hydromechanical elastoplastic framework to assess stress state and stability of unsaturated soil 认领 引用
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作者 ZHANG Yafen ZHU Yulong +2 位作者 ZHOU Yang LIU Hongxi SUN Benbo 《Journal of Mountain Science》 SCIE CSCD 2026年第4期1821-1833,共13页
In the conventional local factor of safety(LFS)method,the Mohr’s circle for stress(MCS)is assumed to shift leftward along the stress axis while maintaining a constant radius as matric suction decreases.It leads to co... In the conventional local factor of safety(LFS)method,the Mohr’s circle for stress(MCS)is assumed to shift leftward along the stress axis while maintaining a constant radius as matric suction decreases.It leads to considerable errors in slope stability assessment under low suction conditions.To improve the accuracy of the LFS method at small matric suction,this paper proposes a coupled hydromechanical elastoplastic framework for evaluating the stress state and stability of each point within unsaturated soil.Based on a validation model utilizing a soil column sample,the simulated and experimental shear strengths under different matric suction(MS)levels are compared.Results show that the proposed framework can reproduce the shear strength of unsaturated soil obtained from the experiments.Subsequently,the coupled framework is applied to simulate a two-dimensional(2D)homogeneous slope model.The simulations demonstrate that at high MS,the radius of the MCS does not change.However,at small MS,the radius of the MCS increases significantly as it shifts leftward along the stress axis.This indicates an amplification effect of MCS(ranging from 21.5%to 25.7%)in unsaturated soil under small matric suction.Based on the correlation between shear stress and MS,three intervals of the MCS variation are identified:the reduction zone(RZ),amplification zone(AZ),and translation zone(TZ).A comparative analysis with two conventional methods,the shear strength reduction technique(SSRT)and the limit equilibrium method(LEM),demonstrates that the LFS method holds potential advantages for slope stability assessment and the analysis of collapse evolution in soils. 展开更多
关键词 Local factor of safety method Coupled hydromechanical framework Elastoplastic mechanical model Mohr’s circle for stress
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THE EQUIVALENT MECHANICAL MODELS OF LIQUID SLOSHING IN A SPHERICAL TANK WITH SPACER UNDER LOW GRAVITY 认领 引用 被引量：3
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作者 CHENGXu-duo HUMei-zhu WENJi-hua 《Journal of Hydrodynamics》 SCIE EI 2005年第1期110-116,共7页
The dynamics of liquid sloshing in a spherical tank with spacer under low gravity was investigated. By extending the characteristic functions, the frequencies of liquid free sloshing, reaction force and moments on the... The dynamics of liquid sloshing in a spherical tank with spacer under low gravity was investigated. By extending the characteristic functions, the frequencies of liquid free sloshing, reaction force and moments on the wall of tank were obtained. By mechanical equivalent principle, the equivalent models of spring vibrator damper of liquid sloshing were given. The numerical results obtained show when a spacer is inserted in the tank, the sloshing frequency of liquid and the sloshing mass of liquid will decrease. 展开更多
关键词 low gravity liquid sloshing equivalent mechanical models
Mechanical and mathematical models of multi-stage horizontal fracturing strings and their application 认领 引用 被引量：1
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作者 Lian Zhanghua Zhang Ying +2 位作者 Zhao Xu Ding Shidong Lin Tiejun 《Natural Gas Industry B》 2015年第2期185-191,共7页
Multi-stage SRV fracturing in horizontal wells is a new technology developed at home and abroad in recent years to effectively develop shale gas or low-permeability reservoirs,but on the other hand makes the mechanica... Multi-stage SRV fracturing in horizontal wells is a new technology developed at home and abroad in recent years to effectively develop shale gas or low-permeability reservoirs,but on the other hand makes the mechanical environment of fracturing strings more complicated at the same time.In view of this,based on the loading features of tubing strings during the multi-stage fracturing of a horizontal well,mechanical models were established for three working cases of multiple packer setting,open differential-pressure sliding sleeve,and open ball-injection sliding sleeve under a hold-down packer.Moreover,mathematical models were respectively built for the above three cases.According to the Lame formula and Von Mises stress calculation formula for the thick-walled cylinder in the theory of elastic mechanics,a mathematical model was also established to calculate the equivalent stress for tubing string safety evaluation when the fracturing string was under the combined action of inner pressure,external squeezing force and axial stress,and another mathematical model was built for the mechanical strength and safety evaluation of multi-stage fracturing strings.In addition,a practical software was developed for the mechanical safety evaluation of horizontal well multi-stage fracturing strings according to the mathematical model developed for the mechanical calculation of the multi-packer string in horizontal wells.The research results were applied and verified in a gas well of Tahe Oilfield in the Tarim Basin with excellent effects,providing a theoretical basis and a simple and reliable technical means for optimal design and safety evaluation of safe operational parameters of multistage fracturing strings in horizontal wells. 展开更多
关键词 Multi-stage fracturing Fracturing string Horizontal well Mechanical model Mathematical model Hold-down packer Sliding sleeve Tarim Basin Tahe oilfield
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Kelvin lattice structures fabricated by laser powder bed fusion:Design,preparation,and mechanical performance 认领 引用
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作者 Yan-peng Wei Huai-qian Li +3 位作者 Ying-chun Ma Zhi-quan Miao Bo Yu Feng Lin 《China Foundry》 SCIE EI CAS CSCD 2025年第2期117-127,共11页
Metallic lattice structures represent advanced architected materials delivering exceptional properties with promising lightweight potential.With the rapid advancement of additive manufacturing,these structures have ga... Metallic lattice structures represent advanced architected materials delivering exceptional properties with promising lightweight potential.With the rapid advancement of additive manufacturing,these structures have garnered increasing research interest.However,most metallic lattice structures generally exhibit anisotropic characteristics,which limits their application ranges.Additionally,a limited number of studies have successfully developed precise mechanical models,which have undergone experimental validation,for the purpose of describing the mechanical response exhibited by additively manufactured metallic lattice structures.In this study,Kelvin lattice structures with varying porosities were systematically designed and fabricated using laser powder bed fusion(LPBF)technology.By integrating finite element simulations with experimental characterization,an enhanced mechanical model was developed through a modification of the Gibson-Ashby model,providing an accurate quantitative description of the relationship between porosity and mechanical properties.The results show that the revised mechanical model can accurately describe the relationship between the geometric parameters and properties of metallic lattice structures.Specifically,the designed Kelvin lattice structures exhibit a smooth stress-strain curve with an obvious yield platform,demonstrating isotropic mechanical properties in all the three spatial directions.This enhances their suitability for complex loading conditions.Meanwhile,the microstructure and manufacturing accuracy of the Kelvin lattice structures were observed and analyzed by micro computed tomography.The results show that the fabricated metallic lattice structures achieved precise dimensional control and optimal densification.This study presents the complete process involved in modeling the Kelvin structure,including its conceptualization,manufacturing,implementation,and ultimately,disposal. 展开更多
关键词 Kelvin structure metallic lattice structures laser powder bed fusion mechanical model isotropic mechanical properties
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Study on Microscopic Interfacial Mechanical Properties of the Gecko's Foot Adhesion Mechanism 认领 引用
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作者 Yilin Su Xuyan Hou +3 位作者 Kaiwei Li Zhe Wang Lei Ren Luquan Ren 《Journal of Bionic Engineering》 SCIE EI CSCD 2025年第4期1776-1787,共12页
The gecko's feet possess unique microstructures that enable strong adhesive forces when interacting with various surfaces.Understanding the interfacial forces generated by these microstructures is crucial for deci... The gecko's feet possess unique microstructures that enable strong adhesive forces when interacting with various surfaces.Understanding the interfacial forces generated by these microstructures is crucial for deciphering their adhesion mechanism.This study developed a contact mechanics model based on van der Waals forces and frictional self-locking effects,incorporating both the spatular pad and spatular shaft of the gecko’s foot microstructures.Building on this foundation,a discrete element simulation model was established using the bonding method to replicate the contact between the gecko's spatula and different surfaces.The dynamic adhesion and detaching processes under normal and tangential external forces were simulated,allowing for the analysis of variation curves of normal and tangential adhesion forces at different detaching angles.This provided insights into the directional adhesion mechanics of the gecko's spatula.Furthermore,a force measurement system was constructed using a multi-degree-of-freedom nano-manipulator and an atomic force microscope within a scanning electron microscope.This system was used to experimentally test the adhesion characteristics of the gecko’s foot microstructures,validating the accuracy of the proposed adhesion mechanics model. 展开更多
关键词 Gecko foot Adhesion mechanics model Discrete element analysis Frictional self-locking effects
An integrated method of data-driven and mechanism models for formation evaluation with logs 认领 引用 被引量：2
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作者 Meng-Lu Kang Jun Zhou +4 位作者 Juan Zhang Li-Zhi Xiao Guang-Zhi Liao Rong-Bo Shao Gang Luo 《Petroleum Science》 SCIE EI CAS CSCD 2025年第3期1110-1124,共15页
We propose an integrated method of data-driven and mechanism models for well logging formation evaluation,explicitly focusing on predicting reservoir parameters,such as porosity and water saturation.Accurately interpr... We propose an integrated method of data-driven and mechanism models for well logging formation evaluation,explicitly focusing on predicting reservoir parameters,such as porosity and water saturation.Accurately interpreting these parameters is crucial for effectively exploring and developing oil and gas.However,with the increasing complexity of geological conditions in this industry,there is a growing demand for improved accuracy in reservoir parameter prediction,leading to higher costs associated with manual interpretation.The conventional logging interpretation methods rely on empirical relationships between logging data and reservoir parameters,which suffer from low interpretation efficiency,intense subjectivity,and suitability for ideal conditions.The application of artificial intelligence in the interpretation of logging data provides a new solution to the problems existing in traditional methods.It is expected to improve the accuracy and efficiency of the interpretation.If large and high-quality datasets exist,data-driven models can reveal relationships of arbitrary complexity.Nevertheless,constructing sufficiently large logging datasets with reliable labels remains challenging,making it difficult to apply data-driven models effectively in logging data interpretation.Furthermore,data-driven models often act as“black boxes”without explaining their predictions or ensuring compliance with primary physical constraints.This paper proposes a machine learning method with strong physical constraints by integrating mechanism and data-driven models.Prior knowledge of logging data interpretation is embedded into machine learning regarding network structure,loss function,and optimization algorithm.We employ the Physically Informed Auto-Encoder(PIAE)to predict porosity and water saturation,which can be trained without labeled reservoir parameters using self-supervised learning techniques.This approach effectively achieves automated interpretation and facilitates generalization across diverse datasets. 展开更多
关键词 Well log Reservoir evaluation Label scarcity Mechanism model Data-driven model Physically informed model Self-supervised learning Machine learning
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Mechanical Constitutive Model for Equivalent Solid of Fission Gas Bubbles in Irradiated U-10Mo Fuels 认领 引用
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作者 Li Yong Yan Feng +2 位作者 Zhang Jing Zang Liye Ding Shurong 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第7期1653-1660,共8页
The internal pressure within fission gas bubbles(FGBs)in irradiated nuclear fuels drives mechanical interactions with the surrounding fuel skeleton.To investigate the micromechanical stress fields in irradiated nuclea... The internal pressure within fission gas bubbles(FGBs)in irradiated nuclear fuels drives mechanical interactions with the surrounding fuel skeleton.To investigate the micromechanical stress fields in irradiated nuclear fuels containing pressurized FGBs,a mechanical constitutive model for the equivalent solid of FGBs was developed and validated.This model was based on the modified Van der Waals equation,incorporating the effects of surface tension.Using this model,the micromechanical fields in irradiated U-10Mo fuels with randomly distributed FGBs were calculated during uniaxial tensile testing via the finite element(FE)method.The macroscopic elastic constants of the irradiated U-10Mo fuels were then derived using homogenization theory,and the influences of bubble pressure,bubble size,and porosity on these constants were examined.Results show that adjacent FGBs exhibit mechanical interactions,which leads to distinct stress concentrations in the surrounding fuel skeleton.The macroscopic elastic constants of irradiated U-10Mo fuels decrease with increasing the macroscopic porosity,which can be quantitatively described by the Mori-Tanaka model.In contrast,bubble pressure and size have negligible effects on these constants. 展开更多
关键词 effective mechanical constitutive model fission gas bubbles FE method U-10Mo nuclear fuels macroscopic elastic constants
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Multiscale characterization of shale softening induced by water-based fluids 认领 引用 被引量：1
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作者 Jianting Du Andrew J.Whittle +2 位作者 Liming Hu Thibaut Divoux Jay N.Meegoda 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期1830-1841,共12页
Characterization of mechanical alterations of shale constituent phases is critical for an in-depth understanding of the underlying mechanisms of shale softening.In this study,a hydro-thermal reaction system is set up ... Characterization of mechanical alterations of shale constituent phases is critical for an in-depth understanding of the underlying mechanisms of shale softening.In this study,a hydro-thermal reaction system is set up to mimic the interactions between shale and water-based fluids under the subsurface environment in shale formations.Using a coupled analysis of grid nanoindentation and in situ mineralogical identification,mechanical alterations of shale constituent mineral phases are revealed.Mechanical degradation of carbonate and clay phases is 10 times greater than quartz,pyrite and organic phases.The KCl additive greatly mitigates mechanical degradation of the clay phase.The high temperature and pressure results in a mechanical degradation of carbonate minerals as much as three times of that occurs at room temperature and atmospheric pressure.Multiscale mechanical models,which are established based on Mori-Tanaka(MT)and self-consistent(SC)schemes,predict more accurate elastic softening of shale composite than the microindentation experiments,due to the microcracks generated in the experiments.Based on the calculation of the multiscale mechanical model,under the subsurface environment of shale formations(e.g.80℃ and 8 MPa),the carbonate dissolution leads to a reduction in Young's modulus of shale composite by about 30%,while the degradation of clay minerals only causes a reduction by up to 9%. 展开更多
关键词 Grid nanoindentation Hydro-thermal treatment Morphological and mineralogical identification Multiscale mechanical model Shale softening
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Digital twin‐based error motion monitoring and prediction method for aerostatic spindle 认领 引用
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作者 Guoda Chen Shenghao Tang +2 位作者 Yuting Jiang Dingxu Zhou Dapeng Tan 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2026年第1期57-73,共17页
The aerostatic spindle is a key component of ultra-precision machine tools,and its error motion is crucial to machining accuracy and reliability.Spindle error motion is unavoidable,and its online monitoring and predic... The aerostatic spindle is a key component of ultra-precision machine tools,and its error motion is crucial to machining accuracy and reliability.Spindle error motion is unavoidable,and its online monitoring and prediction are quite important.Currently,there are relatively few studies on the online monitoring and prediction methods for the aerostatic spindle,and the level of intelligence is relatively low.To address this problem,an error motion monitoring system based on digital twin(DT)technology was established for the aerostatic spindle.A spindle error motion prediction method based on a mechanism and data fusion model(MDFM)was proposed.Additionally,a highly available and interactive aerostatic spindle DT service platform was developed.Experimental results have verified the good performance of this platform.The platform facilitates interaction between the physical and virtual entities of the aerostatic spindle,enabling three-dimensional visualization,monitoring,prediction,and simulation of spindle error motion,and shows good potential for engineering applications. 展开更多
关键词 Aerostatic spindle Digital twin Mechanism and data fusion model Spindle error motion monitoring
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What are the policy effects of implementing a national strategic plan pertaining to territorial functional zoning?An empirical study from Sichuan province 认领 引用 被引量：1
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作者 XIAN Qiong YUAN Meng +3 位作者 YANG Chao HUANG Qiyan HE Yanmei PAN Hongyi 《Journal of Geographical Sciences》 SCIE CSCD 2026年第2期421-448,共28页
The concept of land use multifunctionality(LUMF)is fundamental to national spatial zoning,with its main functions evolving in response to socio-economic development.In this dynamic,maintaining alignment between the ac... The concept of land use multifunctionality(LUMF)is fundamental to national spatial zoning,with its main functions evolving in response to socio-economic development.In this dynamic,maintaining alignment between the actual and the planned main functions is essential for effective spatial planning.This study centers on Sichuan province,where the entropy weight-TOPSIS model was utilized to delineate the spatiotemporal distribution of LUMF and a mechanical equilibrium model was applied to evaluate functional coordination.This approach facilitated an examination of the congruence between the actual and planned main functions.Discrepancy was identified and subsequently excluded from the analysis.Building on this foundation,the propensity score matching–difference-in-differences(PSM-DID)model was employed to quantitatively assess the policy impacts within the matched areas.Key Findings:(1)From 2010 to 2020,the average increase in urban development functions was 10.4,with a decrease in intensity from the urban periphery outward;ecological conservation functions experienced an increase of 1.53,while agricultural functions exhibited a slight decline.(2)Overall,functional coordination showed improvement across 80.32%of the studied areas.However,coordination diminished in key development areas,whereas it was strengthened in agricultural and ecological areas.(3)In 28 counties,a divergence between planned and actual functions was observed,primarily characterized by a focus on agricultural production in key development areas.(4)The planning processes bolstered urban development and ecological conservation functions but exerted limited influence on the major agricultural production areas.The findings provide empirical support for spatial coordination,land allocation,and policy development. 展开更多
关键词 land use multifunctionality main functional area policy effects mechanical equilibrium model PSM-DID model Sichuan province
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Full-field stress evolution and fracture mechanisms in overburden rock strata during coal seam mining 认领 引用
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作者 HAO Yiwei TAO Zhigang +1 位作者 HE Pengfei XIE Lili 《Journal of Mountain Science》 SCIE CSCD 2026年第6期2966-2982,共17页
Large-area collapse of overburden strata represents a major dynamic hazard in coal mining.Understanding the deformation characteristics and stress field evolution of these strata is essential for preventing roof failu... Large-area collapse of overburden strata represents a major dynamic hazard in coal mining.Understanding the deformation characteristics and stress field evolution of these strata is essential for preventing roof failure disasters.Existing research on stress evolution and fracture behavior has largely been based on rock beam theory;however,the beam-arch structural model fails to fully capture the structural characteristics of overburden strata across an entire working face.To further investigate the movement behavior and mechanical responses of overburden strata above the working face,this study takes the 3105-coal seam in the Mataihao Coal Mine,Ordos,Inner Mongolia,as a case study.Using theoretical analysis and numerical simulations with ABAQUS software,a spatially statically indeterminate plate-shell mechanical model was established for different caving stages of the overburden strata and the advance disturbance zone.Analytical functions for the stress field during the elastic and elastic-plastic deformation stages were derived.The results show that during the initial caving stage,significant stress concentration occurs in the midspan region of the overburden,while the central part of the floor experiences tensile stress that intensifies with increasing overhang length.As the working face advances,stress at the coal wall and on the goaf side gradually transitions from tension to compression,with continuously increasing magnitude.During the periodic caving stage,owing to asymmetric boundary conditions(simply supported on the left and fixed on the right),normal stress changes from positive to negative along the mining direction,exhibiting an asymmetric distribution.The peak positions of tensile and compressive stresses shift and differ in magnitude,with compressive stress concentration occurring on the non-mining side.Furthermore,integrating field monitoring data of working conditions,this study analyzes the distribution characteristics of the stress field during both elastic and elastic-plastic deformation stages,as well as the dynamic evolution of advance abutment stress across the entire area.These analyses reveal the non-uniform fracture characteristics and mechanical mechanisms of the stope overburden:the fracture pattern is“O+X”-shaped during the initial caving stage and“X+U”-shaped during the periodic caving stage.These findings provide a scientific basis for predicting fracture locations and optimizing advance abutment strategies in subsequent coal seam mining. 展开更多
关键词 Overburden rock Mechanical model Physical simulation Advance stress Multiple
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Mechanical model of breaking rock and force characteristic of disc cutter 认领 引用 被引量：41
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作者 夏毅敏 欧阳涛 +1 位作者 张新明 罗德志 《Journal of Central South University》 SCIE EI CAS 2012年第7期1846-1858,共13页
According to the cutting characteristics of progressive spiral movement by rotary cutting of the disc cutter, using the broken theory of interaction of compression and shearing, the three-axis force rotary cutting mec... According to the cutting characteristics of progressive spiral movement by rotary cutting of the disc cutter, using the broken theory of interaction of compression and shearing, the three-axis force rotary cutting mechanical model of disc cutter was established and the influence of installation radius, the phase difference and the cutter space on the mechanics of disc cutter were analyzed. The results show that on the same radial line of tunneling interface, the boring distance of cutting tools installed on a different radius is not equal. The cutting radial line of tunneling interface is a polyline and its height is determined by phase angle and penetration of cutting tools. Both phase difference and the installation radius between adjacent disc cutters have little effect on the vertical force and rolling force, but increase with the increase in cutter spacing. In addition, when increasing phase difference and cutter space bilaterally, and reducing installation radius simultaneously, the lateral force would be improved. Related results have been verified onl O0 t rotary tool cutting test platform. 展开更多
关键词 mechanical model phase angle installation radius cutter space disc cutter
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Intermittent disturbance mechanical behavior and fractional deterioration mechanical model of rock under complex true triaxial stress paths 认领 引用 被引量：15
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作者 Zhi Zheng Hongyu Xu +3 位作者 Kai Zhang Guangliang Feng Qiang Zhang Yufei Zhao 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第1期117-136,共20页
Mechanical excavation,blasting,adjacent rockburst and fracture slip that occur during mining excavation impose dynamic loads on the rock mass,leading to further fracture of damaged surrounding rock in three-dimensiona... Mechanical excavation,blasting,adjacent rockburst and fracture slip that occur during mining excavation impose dynamic loads on the rock mass,leading to further fracture of damaged surrounding rock in three-dimensional high-stress and even causing disasters.Therefore,a novel complex true triaxial static-dynamic combined loading method reflecting underground excavation damage and then frequent intermittent disturbance failure is proposed.True triaxial static compression and intermittent disturbance tests are carried out on monzogabbro.The effects of intermediate principal stress and amplitude on the strength characteristics,deformation characteristics,failure characteristics,and precursors of monzogabbro are analyzed,intermediate principal stress and amplitude increase monzogabbro strength and tensile fracture mechanism.Rapid increases in microseismic parameters during rock loading can be precursors for intermittent rock disturbance.Based on the experimental result,the new damage fractional elements and method with considering crack initiation stress and crack unstable stress as initiation and acceleration condition of intermittent disturbance irreversible deformation are proposed.A novel three-dimensional disturbance fractional deterioration model considering the intermediate principal stress effect and intermittent disturbance damage effect is established,and the model predicted results align well with the experimental results.The sensitivity of stress states and model parameters is further explored,and the intermittent disturbance behaviors at different f are predicted.This study provides valuable theoretical bases for the stability analysis of deep mining engineering under dynamic loads. 展开更多
关键词 True triaxial static and disturbance test Mechanical properties Failure mechanism and precursor Intermittent disturbance effect Fractional mechanical model
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Shear failure behaviors and degradation mechanical model of rockmass under true triaxial multi-level loading and unloading shear tests 认领 引用 被引量：6
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作者 Zhi Zheng Ronghua Li +3 位作者 Pengzhi Pan Jinghua Qid Guoshao Su Hong Zheng 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2024年第10期1385-1408,共24页
The redistribution of three-dimensional(3D)geostress during underground tunnel excavation can easily induce to shear failure along rockmass structural plane,potentially resulting in engineering disasters.However,the c... The redistribution of three-dimensional(3D)geostress during underground tunnel excavation can easily induce to shear failure along rockmass structural plane,potentially resulting in engineering disasters.However,the current understanding of rockmass shear behavior is mainly based on shear tests under2D stress without lateral stress,the shear fracture under 3D stress is unclear,and the relevant 3D shear fracture theory research is deficient.Therefore,this study conducted true triaxial cyclic loading and unloading shear tests on intact and bedded limestone under different normal stress σn and lateral stressσpto investigate the shear strength,deformation,and failure characteristics.The results indicate that under differentσnand σp,the stress–strain hysteresis loop area gradually increases from nearly zero in the pre-peak stage,becomes most significant in the post-peak stage,and then becomes very small in the residual stage as the number of shear test cycles increases.The shear peak strength and failure surface roughness almost linearly increase with the increase inσn,while they first increase and then gradually decrease asσpincreases,with the maximum increases of 12.9%for strength and 15.1%for roughness.The shear residual strength almost linearly increases withσn,but shows no significant change withσp.Based on the acoustic emission characteristic parameters during the test process,the shear fracture process and microscopic failure mechanism were analyzed.As the shear stressτincreases,the acoustic emission activity,main frequency,and amplitude gradually increase,showing a significant rise during the cycle near the peak strength,while remaining almost unchanged in the residual stage.The true triaxial shear fracture process presents tensile-shear mixture failure characteristics dominated by microscopic tensile failure.Based on the test results,a 3D shear strength criterion considering the lateral stress effect was proposed,and the determination methods and evolution of the shear modulus G,cohesion cjp,friction angleφjp,and dilation angleψjpduring rockmass shear fracture process were studied.Under differentσnandσp,G first rapidly decreases and then tends to stabilize;cjp,φjp,andψjpfirst increase rapidly to the maximum value,then decrease slowly,and finally remain basically unchanged.A 3D shear mechanics model considering the effects of lateral stress and shear parameter degradation was further established,and a corresponding numerical calculation program was developed based on3D discrete element software.The proposed model effectively simulates the shear failure evolution process of rockmass under true triaxial shear test,and is further applied to successfully reveal the failure characteristics of surrounding rocks with structural planes under different combinations of tunnel axis and geostress direction. 展开更多
关键词 True triaxial shear test Lateral stress effect Acoustic emission monitoring Shear parameters evolution Shear degradation mechanical model
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Mechanical analysis of interaction between plant roots and rock and soil mass in slope vegetation 认领 引用 被引量：9
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作者 言志信 宋云 +1 位作者 江平 王后裕 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2010年第5期617-622,共6页
With the help of plant roots, slope vegetation makes the slope soil mass become a composite material of soil and roots, and thus enhances shear strength of the slope soil mass and stability of the slope. However, the ... With the help of plant roots, slope vegetation makes the slope soil mass become a composite material of soil and roots, and thus enhances shear strength of the slope soil mass and stability of the slope. However, the related studies at present are still qualitative. In this paper, quantitative analysis of the interaction between roots and soil mass are made. By the analysis of the interaction between herbaceous plant roots including lateral roots of woody plants and rock and soil mass, a mechanical model of the interaction between frictional roots and soil is established, and its correctness is shown. A mechanical model of the interaction between anchorage root, namely, woody plant taproot, and soil is also established. The establishment of the models provides a useful means in quantitative analysis of the interaction between plant roots and soil, and has practical values. 展开更多
关键词 slope vegetation vegetation for slope protection mechanical model frictional root anchorage root
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Research on failure criterion of composite based on unified macro- and micro-mechanical model 认领 引用 被引量：7
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作者 Sun Zhigang Zhao Long +1 位作者 Chen Lei Song Yingdong 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2013年第1期122-129,共8页
A new unified macro- and micro-mechanics failure analysis method for composite structures was developed in order to take the effects of composite micro structure into consideration. In this method, the macro stress di... A new unified macro- and micro-mechanics failure analysis method for composite structures was developed in order to take the effects of composite micro structure into consideration. In this method, the macro stress distribution of composite structure was calculated by commercial finite element analysis software. According to the macro stress distribution, the damage point was searched and the micro-stress distribution was calculated by reformulated finite-volume direct averaging micromechanics （FVDAM）, which was a multi-scale finite element method for composite. The micro structure failure modes were estimated with the failure strength of constituents. A unidirectional composite plate with a circular hole in the center under two kinds of loads was analyzed with the traditional macro-mechanical failure analysis method and the unified macro- and micro-mechanics failure analysis method. The results obtained by the two methods are consistent, which show this new method＇s accuracy and efficiency. 展开更多
关键词 Composite Finite-volume direct averaging micromechanics Mechanics failure model Multi-scale finite element Unified macro and micro
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