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Evolution mechanism of water inrush in filling structures of deep-buried tunnels under thermo-hydro-mechanical coupling 认领 引用
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作者 XIAO Xi GUO Weidong +1 位作者 ZHU Xiangxiang SHI Shaoshuai 《Journal of Mountain Science》 SCIE CSCD 2025年第12期4633-4648,共16页
Deep-buried tunnels traversing complex hydrogeological zones with clay-sand-filled structures are highly susceptible to water inrush hazards.High ground temperature,high in-situ stress,and highwater pressure render th... Deep-buried tunnels traversing complex hydrogeological zones with clay-sand-filled structures are highly susceptible to water inrush hazards.High ground temperature,high in-situ stress,and highwater pressure render these events a complex thermohydro-mechanical coupling problem.However,current research on water inrush often insufficiently investigates the multi-field coupled instability mechanisms within highly permeable filling media and frequently neglects the influence of temperature.This study aims to investigate the evolutionary mechanism of seepage instability in filling structures that trigger water inrush hazards under the complex conditions of deep-buried tunnels.Laboratory tests were conducted using a large-scale triaxial thermo-hydro-mechanical system,and a DEM-CFD coupled model was established to numerically simulate the seepage process.The influences of temperature,particle size distribution,and confining pressure were analyzed on the seepage characteristics of the filling media.By examining the variations in water inflow rate,discharged clay-sand particle mass,porosity and permeability,we analyzed the entire process of seepage behavior and instability evolution under the thermohydro-mechanical coupling effect.The results show that:(1)Temperature significantly affects water inflow,discharged particle mass,porosity,and permeability.Higher temperatures remarkably increase porosity and permeability,with the maximum permeability coefficient of filling media at 90℃being 1.6 times that at 45℃.(2)The Talbol power index exhibits a positive correlation with water inflow rate and discharged particle mass,while confining pressure is negatively correlated with water inflow rate.(3)For filling materials dominated by clay-sand particles or with favorable gradation,the seepage instability process exhibits distinct phase characteristics,with different stages reflected in changes in water inflow,porosity,and permeability.The experimental results are consistent with the numerical simulation results.(4)In high ground temperature environments,temperature enhances convective heat transfer and energy exchange between water and filling media,thereby accelerating the process of water inrush caused by seepage instability.The findings provide scientific support for risk assessment,early warning,and prevention of water inrush hazards in deep-buried tunnels crossing clay-sand-filled structures. 展开更多
关键词 Thermo-hydro-mechanical coupling Filling structure Water inrush Seepage evolution Tunnel
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Review of Crashworthiness Studies on Cellular Structures 认领 引用 被引量：3
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作者 Hongyu Liang Ying Zhao +2 位作者 Shixian Chen Fangwu Ma Dengfeng Wang 《Automotive Innovation》 EI CSCD 2023年第3期379-403,共25页
The application of lightweight structures with excellent energy absorption performance is crucial for enhancing vehicle safety and energy efficiency.Cellular structures,inspired by the characteristics observed in natu... The application of lightweight structures with excellent energy absorption performance is crucial for enhancing vehicle safety and energy efficiency.Cellular structures,inspired by the characteristics observed in natural organisms,have exhibited exceptional structural utilization in terms of energy absorption compared with traditional structures.In recent years,various innovative cellular structures have been proposed to meet different engineering needs,resulting in significant performance improvements.This paper provides a comprehensive overview of novel cellular structures for energy absorption applications.In particular,it outlines the application forms and design concepts of cellular structures under typical loading conditions in vehicle collisions,including axial loading,oblique loading,bending loading,and blast loading.Cellular structures have evolved to meet the demands of complex loading conditions and diverse research methods,focusing on achieving high-performance characteristics across multiple load cases.Moreover,this review discusses manufacturing techniques and strate-gies for enhancing the manufacturing performance of cellular structures.Finally,current key challenges and future research directions for cellular structures are discussed.The aim of this study is to provide valuable guidelines for researchers and engineers in the development of next-generation lightweight cellular structures. 展开更多
关键词 Honeycomb Lattice structure Multi-cell tube Cellular structure filled tube Crashworthiness Multiple load cases
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