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Mechanical properties of frozen rock mass with two diagonal intersected fractures 认领 引用 被引量：6
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作者 Hao Yang Renliang Shan +2 位作者 Jinxun Zhang Fumei Wu Zhiming Guo 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2018年第4期626-633,共8页
Based on previous research results, this paper investigated the influence of fracture morphology on mechanical properties and failure modes of rock mass with two diagonal intersected fractures. This study carried out ... Based on previous research results, this paper investigated the influence of fracture morphology on mechanical properties and failure modes of rock mass with two diagonal intersected fractures. This study carried out a series of triaxial compression tests on rock-like specimens with two crossed fractures under negative temperature, concluded the following conclusions. The strength and failure modes of rock mass are significantly influenced by the dips of two crossed fractures. The strength of rock mass with two frac- tures cannot simply be estimated using the method that was developed for the rock mass with a single fracture. When the intersecting angle is less than 30~, the failure plane initiates at the tip of ＂artificial rup- tures＂ and extends to the upper and lower ends of the specimen. In case of a higher dip and intersecting angle ranging from 30° to 60°, the failure plane propagates along one of these two fractures. The mechan- lca! parameters of rock mass are not only related to the trace length, but also depend on the trace !ength ratio. One could roughly calculate the strength parameters using the approximation proposed in.this paper..For the rock mass with a trace length ratio 〈0.3 （short trace length/long trace length）, the failure mode is dependent on the fracture with a longer trace length. When the trace length becomes significant and the trace length ratio approximates to 1, the failure plane propagates along two fractures, where an X-shaped.failure pattern is presented： For the rock mass with moderate frac!ures and a trace length ratio of approxlmately 1, the failure mode Is.Independent on fractures, which is simllar to .the damage pattern of intact rock. The strength, and elastic .modulus of rock mass decrease with the increase of spacing between fractures, whl!e Polsson＇s ratio is Independent on the spacing. The failure mode can be deter- mined by the area. of triangle created by two fractures. Damage occurs at the smaller triangle area first, and propagates with the two sides of the larger triangle. 展开更多
关键词 Intersected fractures Fracture morphology Failure modes Mechanical properties
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Investigation of the Mechanism of Grout Penetration in Intersected Fractures 认领 引用 被引量：3
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作者 Yanxu Guo Peng Zhao +3 位作者 Qingsong Zhang Rentai Liu Lianzhen Zhang Yankai Liu 《Fluid Dynamics & Materials Processing》 EI 2019年第4期321-342,共22页
To study the penetration mechanism of cement-based slurry in intersected fractures during grouting and the related pressure distribution,we have used two different variants of cement,namely,basic cement slurry and fas... To study the penetration mechanism of cement-based slurry in intersected fractures during grouting and the related pressure distribution,we have used two different variants of cement,namely,basic cement slurry and fast-setting cement slurry.The influence of a retarder,time-varying viscosity,fracture width and location of injection hole is also considered.A finite element software is used to implement two and three-dimensional numerical models for grouting of intersected fractures in hydrostatic conditions.Results show that there are significant differences in the diffusion morphology and pressure distribution depending on the considered cement slurry.Retarder can effectively slow down the rising rate of injection pressure and extend the diffusion distance of grout.The influence of the branch fracture is more important when basic cement slurry is considered,indicating that the change of grout pressure is correlated with the slurry viscosity.The faster the viscosity increases,the less evident is the effect. 展开更多
关键词 Fracture grouting numerical investigation intersected fractures mechanism of grout penetration
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Convective heat transfer of water flow in intersected rock fractures for enhanced geothermal extraction 认领 引用 被引量：11
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作者 Yuedu Chen Zhihong Zhao Huan Peng 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2022年第1期108-122,共15页
Numerous intersected rock fractures constitute the fracture network in enhanced geothermal systems.The complicated convective heat transfer behavior in intersected fractures is critical to the heat recovery in fractur... Numerous intersected rock fractures constitute the fracture network in enhanced geothermal systems.The complicated convective heat transfer behavior in intersected fractures is critical to the heat recovery in fractured geothermal reservoirs.A series of three-dimensional intersected fracture models is constructed to perform the flow-through heat transfer simulations.The geometry effects of dead-end fractures(DEFs)on the heat transfer are evaluated in terms of intersected angles,apertures,lengths,and the connectivity.The results indicate that annular streamlines appear in the rough DEF and cause an ellipse distribution of the cold front.Compared to plate DEFs,the fluid flow in the rough DEF enhances the heat transfer.Both the increment of outlet water temperatureΔToutand the ratio of heat production Qrpresent the largest at the intersected angle of 90°while decline with the decrease of the intersected angle between the main flow fracture(MFF)and the DEFs.The extension of the length of intersected DEFs is beneficial to heat production while enhancing its aperture is not needed.Solely increasing the number of intersected DEFs induces a little increase of heat extraction,and more significant heat production can be obtained through connecting these DEFs with the MFF forming the flow network. 展开更多
关键词 Heat transfer Fracture intersection Fluid flow Rough fracture Geothermal extraction
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Flow Deflection in Intersected Tubes 认领 引用
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作者 Tian Kaiming Wan Li Department of Water Resources and Environmental Science, China University of Geosciences, Beijing 100083 《Journal of Earth Science》 EI CAS 2000年第4期54-56,共3页
In order to verify the flow interference at the fracture intersections, a group of hydraulic simulations of crossing flow was carried out. The manifold interference effects at the intersection of fractures on water fl... In order to verify the flow interference at the fracture intersections, a group of hydraulic simulations of crossing flow was carried out. The manifold interference effects at the intersection of fractures on water flow has been confirmed extensively either in the normal or in the oblique intersected tubes as well as in the intersected tubes of either equal or variant diameters. Consequently, suggest that the fissure network can no longer be taken as a set of solitary fractures, but as a set of elementary intersected fractures. The deflection effect at fracture intersections on the water flow should be taken into consideration when is dealt with any theory related to the water migration in fractures. 展开更多
关键词 crossing flow intersected tube flow deflection flow interference at intersection hydraulic simulation.
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Optimization of throttling windows to improve flow control of three-way control combiner valves 认领 引用 被引量：1
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作者 Jin-yuan QIAN Zhe-hui MA +7 位作者 Shi-jie LIN Chuang LIU Yu-wei WANG Fei LING Liang ZHANG Man-man CUI Tian-zuo QU Zhi-jiang JIN 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2026年第3期275-287,共13页
Three-way control combiner valves(TCCVs)are critical components used in nuclear power plants to regulate the concentration of boron acid for neutron absorption and reactor safety.However,current TCCV designs often suf... Three-way control combiner valves(TCCVs)are critical components used in nuclear power plants to regulate the concentration of boron acid for neutron absorption and reactor safety.However,current TCCV designs often suffer from suboptimal control performance and high flow resistance,leading to control deviations and reduced operational efficiency.In this paper,a numerical model based on the standard K–ωturbulence model is established and validated against experimental data to analyze the flow characteristics and local flow resistance of a TCCV.A parametric design method for the throttling windows is proposed,establishing relationships between shape parameters and performance indexes,including control performance and flow resistance.The adaptive non-dominated sorting genetic algorithm(ANSGA-II)is used to optimize the shape parameters of the throttling windows.The optimization results show an improvement in the performance indexes of the TCCV,with the adjustable operating range increasing by 31.0%and the maximum local resistance decreasing by 18.3%.We also introduce the concepts of effective and controllable domains to characterize the inlet backflow phenomena and regulation dead zones,which are crucial for ensuring the reliability and effectiveness of control valves.These findings provide insights for enhancing the design and performance of TCCVs in nuclear power plants. 展开更多
关键词 Three-way valve Intersection flow Throttling windows Multi-objective optimization
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信控交叉口机动车尾气排放量影响因素研究 认领 引用 被引量：1
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作者 涂圣文 郭文宇 雷梅梅 《中外公路》 CAS 2026年第2期272-279,共8页
为揭示影响信号控制交叉口机动车尾气排放量的主要因素及其作用机理,该文以专业的交叉口机动车尾气排放分析软件系统SIDRA INTERSECTION为研究工具,从交通流特性、信号周期和信号配时方案等方面探究了交叉口区域机动车二氧化碳(CO2)... 为揭示影响信号控制交叉口机动车尾气排放量的主要因素及其作用机理,该文以专业的交叉口机动车尾气排放分析软件系统SIDRA INTERSECTION为研究工具,从交通流特性、信号周期和信号配时方案等方面探究了交叉口区域机动车二氧化碳(CO2)、氮氧化物(NOx)、一氧化碳(CO)和碳氢化合物(HC)等尾气排放量的影响因素及其影响规律。研究结果表明:①道路交叉口处机动车的车均尾气排放量随着交通量的上升而升高,并且交叉口交通总量越大,车均尾气排放量增量越大;②随着信号周期的增加,各种尾气排放量均先急剧下降,达到最低值后又呈缓慢上升趋势。同时,交通总量越大,尾气排放量出现最低值时的信号周期越长;③4种尾气中,NOx排放量对周期变化的敏感性低于其他3种尾气;④当入口道交通流量超过800 veh/h后,路口单边轮放策略下的机动车污染物排放量呈现显著上升趋势,其排放水平明显高于相同条件下左转保护型策略的两种放行方式;⑤交叉口交通流量的大小显著影响左转车辆占比与机动车污染物排放之间的关联性,随着交叉口交通总量的增加,左转比例对尾气排放的效应更为突出。 展开更多
关键词 智能交通 信控交叉口 尾气排放量 SIDRA INTERSECTION软件
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An Optimal Right-Turn Coordination System for Connected and Automated Vehicles at Urban Intersections 认领 引用
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作者 Mahmudul Hasan Shuji Doman +2 位作者 A.S.M.Bakibillah Md Abdus Samad Kamal Kou Yamada 《Computers, Materials & Continua》 SCIE EI 2026年第1期430-446,共17页
Traffic at urban intersections frequently encounters unexpected obstructions,resulting in congestion due to uncooperative and priority-based driving behavior.This paper presents an optimal right-turn coordination syst... Traffic at urban intersections frequently encounters unexpected obstructions,resulting in congestion due to uncooperative and priority-based driving behavior.This paper presents an optimal right-turn coordination system for Connected and Automated Vehicles(CAVs)at single-lane intersections,particularly in the context of left-hand side driving on roads.The goal is to facilitate smooth right turns for certain vehicles without creating bottlenecks.We consider that all approaching vehicles share relevant information through vehicular communications.The Intersection Coordination Unit(ICU)processes this information and communicates the optimal crossing or turning times to the vehicles.The primary objective of this coordination is to minimize overall traffic delays,which also helps improve the fuel consumption of vehicles.By considering information from upcoming vehicles at the intersection,the coordination system solves an optimization problem to determine the best timing for executing right turns,ultimately minimizing the total delay for all vehicles.The proposed coordination system is evaluated at a typical urban intersection,and its performance is compared to traditional traffic systems.Numerical simulation results indicate that the proposed coordination system significantly enhances the average traffic speed and fuel consumption compared to the traditional traffic system in various scenarios. 展开更多
关键词 Right-turn coordination connected and automated vehicles vehicular communication edge processing urban intersection
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Vehicle intention recognition at signalized intersections based on security-aware inverse reinforcement learning 认领 引用
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作者 BEN Wei MING Xiqin +2 位作者 LI Bing YIN Guodong JIANG Fei 《Journal of Southeast University(English Edition)》 EI CAS 2026年第2期165-172,共8页
To address the challenge of distinguishing subjective aggressive driving(initiated by drivers)from hazardous behaviors caused by external cyberattacks,this study proposes an innovative intent recognition framework nam... To address the challenge of distinguishing subjective aggressive driving(initiated by drivers)from hazardous behaviors caused by external cyberattacks,this study proposes an innovative intent recognition framework named Intent-Decipher.By integrating the information credibility outputted by an intrusion detection system(IDS)into a security-aware inverse reinforcement learning(SA-IRL)model,the framework infers the reward function behind vehicle behaviors and classifies three key driving intents:normal,aggressive,and malicious.Experiments were conducted on a semi-synthetic dataset containing 20000 trajectories.Results show that Intent-Decipher significantly outperforms baseline methods in classification accuracy,achieving a macro-average F1-score of 0.94.Notably,Intent-Decipher excels at differentiating subjective aggressive driving from attack-induced behaviors:its F1-score for identifying malicious attack-induced(MAI)intent reaches 0.90,an absolute improvement of 0.16 compared with the standard inverse reinforcement learning(IRL)model(which lacks security awareness and only achieves an F1-score of 0.74). 展开更多
关键词 signalized intersections intent recognition anomaly detection inverse reinforcement learning(IRL) vehicular ad-hoc networks
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The impact of electric vehicles’strong acceleration performance on traffic safety risks at signalized intersections:a case study in China 认领 引用
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作者 Junhua Wang Ailin Zheng +4 位作者 Jie Qing Shuke Xie Ting Fu Qiangqiang Shangguan Lu Dai 《International Journal of Transportation Science and Technology》 EI CSCD 2026年第2期141-158,共18页
Electrification has become a major trend in the automotive industry.Compared with traditional fuel-powered vehicles,electric vehicles(EVs)exhibit stronger acceleration performance,which may impact traffic safety risks... Electrification has become a major trend in the automotive industry.Compared with traditional fuel-powered vehicles,electric vehicles(EVs)exhibit stronger acceleration performance,which may impact traffic safety risks.The pronounced acceleration capability of EVs is particularly evident at low speeds,with signalized intersections—key components of road networks—facing complex traffic flows and heightened safety risks.Therefore,investigating the impact of EVs’strong acceleration on traffic safety risks at signalized intersections is crucial for ensuring urban traffic safety.This study utilizes unmanned aerial vehicles(UAVs)and roadside cameras to construct a detailed trajectory dataset,including license plate types and vehicle dimensions.Based on time to collision(TTC)as a fundamental metric and incorporating the risk management quadrant principle,a two-dimensional integrated safety surrogate indicator is proposed,accounting for both collision probability and severity.The study also achieves automated extraction of safety surrogate indicators from trajectory data,quantifying the impact of EVs on traffic safety risks at signalized intersections.Case studies in urban and suburban areas provide a comparative analysis of driving behaviors and interactive safety risks between EVs and fuel-powered vehicles.At a 90%confidence level,the frequency of events where EVs have a higher likelihood of collisions but lower severity is 0.87%higher than that of fuel-powered vehicles,indicating that EVs are more likely to experience low-severity collisions. 展开更多
关键词 Electric vehicle(EV) Signalized intersection Traffic safety Safety substitute index
Fast beam migration capable of dealing with intersecting events 认领 引用
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作者 Zhi-Miao Chang Fu-Xing Han +4 位作者 Zheng-Hui Gao Zhang-Qing Sun Shou-Dong Huo Gang Li Ming Zhang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期190-204,共15页
Fast beam migration(FBM),characterized by its super-high efficiency in velocity model building,consists of three main steps:beam forming,beam propagation,and image forming.The super-high efficiency is achieved by beam... Fast beam migration(FBM),characterized by its super-high efficiency in velocity model building,consists of three main steps:beam forming,beam propagation,and image forming.The super-high efficiency is achieved by beam forming,as it needs only to be performed once for one dataset and is independent of velocity,and the other two steps take relatively little time.However,compared to the beam-propagation and image-forming steps,the beam-forming step is still quite time-consuming owing to the high-dimensional computing problem of estimating the source and receiver slope orientation of a beam.Furthermore,previous methods for estimating the source and receiver slope orientation of a beam struggled to deal with intersecting events,leading to poor imaging results for complex subsurface structures,such as unconformities or faults,where events often intersect.We propose the use of a three-step multimodal optimization method based on the neighborhood crowding differential evolution(NCDE)algorithm to estimate the source and receiver slope orientation of a beam during the beam-forming step,which can quickly and accurately obtain slope orientations when events intersect.We first test the three-step multimodal optimization algorithm on a 3D super-gather and provide the parameter criteria.We then apply the FBM based on the three-step multimodal optimization algorithm to the Marmousi 2 and 3D SEG/EAGE salt models.Both results demonstrate that the proposed method can image intersecting events well and that the imaging quality of complex zones is improved.We also apply the proposed method to a 2D offshore seismic dataset containing abundant intersecting events,which validates the practicality of the proposed method. 展开更多
关键词 Fast beam migration(FBM) Intersecting events Multimodal optimization method Neighborhood crowding differential evolution(NCDE)algorithm High-dimensional computing problem
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Numerical Analysis of Temperature Field Distribution Characteristics of Surrounding Rock in Cross-Line Subway Tunnels 认领 引用
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作者 Aoyu Zheng Ye Wang +1 位作者 Huanhuan Li Yuanfeng Lu 《Frontiers in Heat and Mass Transfer》 EI CAS 2026年第2期320-346,共27页
Subway operations generate substantial heat,and inadequate dissipation can progressively degrade tunnel thermal conditions.The thermal distribution within the surrounding rock is critical for calculating the load on s... Subway operations generate substantial heat,and inadequate dissipation can progressively degrade tunnel thermal conditions.The thermal distribution within the surrounding rock is critical for calculating the load on subway environmental control systems.However,the heat transfer patterns in the surrounding rock for intersecting tunnels remain poorly understood.Therefore,this study employs COMSOL software to numerically analyze the impact of intersecting line layouts on the temperature field distribution within the surrounding rock.Results indicate that when tunnels intersect,heat accumulates in the surrounding rock near the intersection.Compared to the single-tunnel structure,intersecting tunnels exhibit higher peak temperature when reaching dynamic thermal equilibrium,and the time required to achieve equilibrium is longer.Reducing the vertical spacing between intersecting tunnels concentrates heat within the intersection zone,leading to elevated temperature in that area.However,when the vertical spacing exceeds 12 m,the numerical value no longer exhibits significant variation with vertical spacing.The intersection angle also influences the temperature distribution characteristic and numerical value.The smaller intersection angle causes heat to concentrate within the crossing zone,leading to an overall increase in surrounding rock temperature within that area.Additionally,the rate of temperature increase in the rock mass at the intersection zone and the magnitude of temperature at dynamic equilibrium are significantly influenced by geographical factors.The lower the ambient temperature in the climate zone where the intersecting subway tunnels are located,the faster the temperature rise rate at the intersection zone.When heat transfer in the rock mass reaches dynamic equilibrium,the temperature difference at the same monitoring point can reach approximately 10℃ between severely cold and temperate regions. 展开更多
关键词 Subway tunnel intersecting lines surrounding rock and soil temperature field simulation modeling
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PyQED:A Python Framework for Ab Initio Geometric Quantum Dynamics 认领 引用
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作者 Yujuan Xie Xiaotong Zhu Bing Gu 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2026年第2期159-170,I0169,共12页
PyQED is an open-source Python package designed for the numerical simulation of strongly coupled elec-tron-nuclear quantum dynamics,in particular,conical intersection dy-namics.Besides conventional nona-diabatic wavep... PyQED is an open-source Python package designed for the numerical simulation of strongly coupled elec-tron-nuclear quantum dynamics,in particular,conical intersection dy-namics.Besides conventional nona-diabatic wavepacket dynamics methods based on the Born-Huang representation and mixed quantum-classical Ehrenfest dynamics,PyQED implements the geometric quantum dynamics based on the local diabatic representation,which provides a numerically exact framework for nonadiabatic quantum molecular dynamics.It differs from the conven-tional Born-Huang representation in that all non-Born-Oppenheimer effects are accounted for by a single electronic overlap matrix between adiabatic states,therefore removing the sin-gular derivative couplings.The complete workflow for ab initio modeling of conical intersec-tion dynamics is illustrated through the internal conversion dynamics in the H3+cation.PyQED provides a powerful and user-friendly computational platform for first-principles quantum dynamics,with applications to photochemical and photophysical processes. 展开更多
关键词 Ab initio geometric quantum dynamics Electronic overlap matrix Local dia-batic representation Nonadiabatic molecular dynamics Conical intersection
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Deep Learning-Aided Frequency-Modulated Continuous-Wave Radar for Around-the-Corner Non-Line-of-Sight Perception at Urban Intersections 认领 引用
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作者 Shih-Lin Lin Yi-Hsuan Chen 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第4期1102-1122,共21页
Urban intersections contain severe blind zones where buildings and roadside obstacles block lineof-sight sensing,limiting the ability of autonomous vehicles to anticipate hidden hazards.This paper presents an urban-in... Urban intersections contain severe blind zones where buildings and roadside obstacles block lineof-sight sensing,limiting the ability of autonomous vehicles to anticipate hidden hazards.This paper presents an urban-intersection-oriented non-line-of-sight(NLOS)perception framework that exploits specular reflections from building surfaces using 77 GHz frequency-modulated continuous-wave(FMCW)automotive radar.All evaluations are conducted in a MATLAB-based simulation environment that models intersection geometry,building-induced occlusions,and specular reflection-assisted propagation,and generates 77-GHz FMCW radar echoes under controllable interference;real-world validation with measured radar data and richer multipath/material modeling is planned as future work.To improve robustness under noisy intersection interference,we propose a deep-learning-based mitigation module that restores corrupted radar echoes at the chirp level using a compact AlexNet-derived 1D regression backbone,with minimal architectural changes that insert a residual block after conv2 and apply batch normalization to enhance training stability and suppress interference while preserving informative echo characteristics.The restored echoes are then processed by conventional estimation steps to obtain range and azimuth-related angles.Under severe interference(Noise Factor=3.0),unmitigated measurements exhibit large errors(root-mean-square error(RMSE)=5.48 m/18.95°/10.77°for range/angle/azimuth deviation).Conventional AlexNet-based mitigation reduces these errors to 0.75 m/0.83°/0.93°,while the proposed improved AlexNet further reduces them to 0.56 m/0.46°/0.73°.The results demonstrate improved signal stability and measurement accuracy,supporting the potential practicality of low-cost NLOS perception in simulation for safety-critical autonomous driving at occluded urban intersections,subject to future real-world validation. 展开更多
关键词 FMCW doppler radar non-line-of-sight(NLOS)perception urban intersections specular reflection interference mitigation radar-echo restoration residual learning batch normalization AlexNet autonomous driving
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Stone Go Board and Pieces 认领 引用
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《China's Tibet》 2026年第3期F0003-F0003,共1页
The Go board is rectangular in shape,featuring a pit at each end designed for storing playing pieces.The board comprises a 17×17 grid,forming 289 intersection points where pieces are placed.The two sets of pieces... The Go board is rectangular in shape,featuring a pit at each end designed for storing playing pieces.The board comprises a 17×17 grid,forming 289 intersection points where pieces are placed.The two sets of pieces are distinguished by color—black and white—each meticulously polished and uniformly sized,comparable in quality and appearance to those used by modern Go players. 展开更多
关键词 intersection points playing pieces rectangular pit grid black go board storage
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“钢铁交警”酷炫上岗 认领 引用
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作者 刘畅 《疯狂英语（新读写）》 2026年第5期50-52,79,共3页
主题:交通与科技篇幅:338词建议用时:7分钟“1 For your safety,please ride bicycles in the non-motorized lane,”a voice called out to a cyclist veering into the motor vehicle lane at a busy intersection in Wuhu City,Anhui... 主题:交通与科技篇幅:338词建议用时:7分钟“1 For your safety,please ride bicycles in the non-motorized lane,”a voice called out to a cyclist veering into the motor vehicle lane at a busy intersection in Wuhu City,Anhui Province.The warning,however,came not from a human traffic officer,but from a humanoid robot standing upright on a safety island. 展开更多
关键词 intersection safety safety island humanoid robot technology motor vehicle traffic
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Research on Signal Timing Optimization and Traffic Efficiency Improvement at Highway Intersections under the Background of Intelligent Transportation 认领 引用
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作者 Runqiu Xu 《Journal of Architectural Research and Development》 2026年第2期1-7,共7页
This paper aims to enhance highway traffic efficiency by integrating a project focused on signal timing optimization at highway intersections.Supported by intelligent technologies,a reasonable optimization system is c... This paper aims to enhance highway traffic efficiency by integrating a project focused on signal timing optimization at highway intersections.Supported by intelligent technologies,a reasonable optimization system is constructed.Practical application demonstrates that the signal timing optimization at highway intersections under this system yields significant results,substantially improving traffic efficiency.This provides a reference for subsequent signal timing optimization at highway intersections,aligning with the development needs of the intelligent transportation context. 展开更多
关键词 Highway intersections Signal timing optimization Intelligent transportation Dynamic signal timing
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A new theory for determining large deformation area of roof at intersection and verification analysis 认领 引用 被引量：3
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作者 WU Yi-yi GAO Yu-bing +2 位作者 MA Xiang ZHANG Xing-xing HE Man-chao 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第2期656-677,共22页
The intersection is a widely used traffic line structure from the shallow tunnel to the deep roadway,and determining the subsidence hidden danger area of the roof is the key to its stability control.However,applying t... The intersection is a widely used traffic line structure from the shallow tunnel to the deep roadway,and determining the subsidence hidden danger area of the roof is the key to its stability control.However,applying traditional maximum equivalent span beam(MESB)theory to determine deformation range,peak point,and angle influence poses a challenge.Considering the overall structure of the intersection roof,the maximum equivalent triangular plate(METP)theory is proposed,and its geometric parameter calculation formula and deflection calculation formula are obtained.The application of the two theories in 18 models with different intersection angles,roadway types,and surrounding rock lithology is verified by numerical analysis.The results show that:1)The METP structure of the intersection roof established by the simulation results of each model successfully determined the location of the roof’s high displacement zone;2)The area comparison method of the METP theory can be reasonably explained:①The roof subsidence of the intersection decreases with the increase of the intersection angle;②The roof subsidence at the intersection of different roadway types has a rectangular type>arch type>circular type;③The roof subsidence of the intersection with weak surrounding rock is significantly larger than that of the intersection with hard surrounding rock.According to the application results of the two theories,the four advantages of the METP theory are compared and clarified in the basic assumptions,mechanical models,main viewpoints,and mechanism analysis.The large deformation inducement of the intersection roof is then explored.The J 2 peak area of the roof drives the large deformation of the area,the peak point of which is consistent with the center of gravity position of the METP.Furthermore,the change in the range of this peak is consistent with the change law of the METP’s area.Hence,this theory clarifies the large deformation area of the intersection roof,which provides a clear guiding basis for its initial support design,mid-term monitoring,and late local reinforcement. 展开更多
关键词 roadway intersection roof deformation equivalent span theory triangular plate structure numerical analysis stress partial tensor
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Mechanism of proppant transport and deposition in rough intersecting fractures after offshore fracturing 认领 引用 被引量：3
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作者 Biao Yin Yi-Shan Lou +1 位作者 Shan-Yong Liu Yan Zhang 《Petroleum Science》 SCIE EI CAS CSCD 2025年第3期1270-1288,共19页
To accurately analyze proppant transport in rough intersecting fractures and elucidate the interaction mechanisms among liquid,particles,and rough walls,this study reconstructed a numerical model of fractures in inhom... To accurately analyze proppant transport in rough intersecting fractures and elucidate the interaction mechanisms among liquid,particles,and rough walls,this study reconstructed a numerical model of fractures in inhomogeneous reservoirs with varying brittleness index(BI).Various auto-correlation Gaussian rough fracture models were created using Matlab to assess roughness through the fractal dimension method.This research innovatively combined Boolean operations to establish three-dimensional rough fracture models,incorporating(Computational Fluid Dynamics)CFD-DEM(Discrete Element Method)with a bidirectional method for cosimulation.The proppant transport in fractures was categorized into three zones based on the difference in the turbulent kinetic energy.Artificially induced fracture roughness increases fluid retention and turbulence,causing plugging effects and limiting proppant flow into branch fractures.Additionally,compared with the superior deposition and significant support effects of the spherical proppant,the low-sphericity proppant traveled farther under fracturing fluid,inducing more pronounced plugging near curved fracture intersections;the variation in fracture intersection angles primarily impacted the wall shear stress within the flow field,indicating smaller angles led to higher shear energy at the intersection.Compared with the intersection angle of 30°,the height and area deposited in the 90 branch fracture increased by 52.25%and 65.33%,respectively:notably,injecting proppant from smaller to larger particles(S:M:L)and a low velocity effectively ensured fracture conductivity near the wellbore at joint roughness coefficient(JRC)≥46 while achieving satis-factory placement in the branch fracture,making it a recommended approach. 展开更多
关键词 Hydraulic fracturing Intersecting fracture Proppant Turbulent kinetic energy CFD-DEM Sphericity Joint roughness coefficient
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High-Precision and Ultraspeed Monitoring of Melt-Pool Morphology in Laser-Directed Energy Deposition Using Deep Learning 认领 引用 被引量：6
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作者 Jiayu Yang Guan Liu +4 位作者 Wei Zhu Yingjie Zhang Wenbin Zhou Defu Liu Yongcheng Lin 《Additive Manufacturing Frontiers》 CSCD 2025年第2期81-89,共9页
Laser-directed energy deposition(L-DED)is an advanced additive manufacturing technology primarily adopted in metal three-dimensional printing systems.The L-DED process is characterized by various defects,thus necessit... Laser-directed energy deposition(L-DED)is an advanced additive manufacturing technology primarily adopted in metal three-dimensional printing systems.The L-DED process is characterized by various defects,thus necessitating the extensive use of in-situ monitoring to enable real-time adjustments of process parameters by detecting molten-pool features.To address the challenge of accurately extracting the molten-pool morphology from an undetached spatter,an innovative monitoring method based on the U-Net(U-shaped network)is proposed herein.A lightweight architecture accelerates the processing speed,whereas an enhanced loss function incorporating weight maps augments the segmentation precision.The model performance is evaluated by comparing its segmentation accuracy and processing speed with those of the conventional U-Net,using the mean intersection over union(MIoU)as the segmentation metric.The improved model demonstrates superior segmentation accuracy at the interface between the molten pool and spatter,with a peak MIoU of 0.9798 achieved on the test set.Furthermore,this model processes each image in an extremely short time of 17.9 ms.Using this segmentation algorithm,the error in extracting the molten-pool width from single-track experiments is within 0.1 mm.The proposed method for monitoring the molten-pool morphology is suitable for deployment in online monitoring systems,thus providing a foundation for subsequent process-parameter regulation. 展开更多
关键词 Laser-directed energy deposition Molten-pool morphology Semantic segmentation Mean intersection over union(MIoU)
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Cubature Kalman Fusion Filtering Under Amplify-and-Forward Relays With Randomly Varying Channel Parameters 认领 引用 被引量：2
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作者 Jiaxing Li Zidong Wang +2 位作者 Jun Hu Hongli Dong Hongjian Liu 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2025年第2期356-368,共13页
In this paper, the problem of cubature Kalman fusion filtering(CKFF) is addressed for multi-sensor systems under amplify-and-forward(AaF) relays. For the purpose of facilitating data transmission, AaF relays are utili... In this paper, the problem of cubature Kalman fusion filtering(CKFF) is addressed for multi-sensor systems under amplify-and-forward(AaF) relays. For the purpose of facilitating data transmission, AaF relays are utilized to regulate signal communication between sensors and filters. Here, the randomly varying channel parameters are represented by a set of stochastic variables whose occurring probabilities are permitted to exhibit bounded uncertainty. Employing the spherical-radial cubature principle, a local filter under AaF relays is initially constructed. This construction ensures and minimizes an upper bound of the filtering error covariance by designing an appropriate filter gain. Subsequently, the local filters are fused through the application of the covariance intersection fusion rule. Furthermore, the uniform boundedness of the filtering error covariance's upper bound is investigated through establishing certain sufficient conditions. The effectiveness of the proposed CKFF scheme is ultimately validated via a simulation experiment concentrating on a three-phase induction machine. 展开更多
关键词 Amplify-and-forward(AaF)relays covariance intersection fusion cubature Kalman filtering multi-sensor systems uniform boundedness
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