Seismic responses and shattering cumulative effects of bedding parallel stepped rock slope:Model test and numerical simulation  

作　　者：Chunlei Xin Fei Yang Wenkai Feng Zhao Wang Wenhui Li 

机构地区：[1]State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu,China [2]College of Environment and Civil Engineering,Chengdu University of Technology,Chengdu,China [3]Institute of Mountain Hazards and Environment,Chinese Academy of Sciences(CAS),Chengdu,China [4]Institute for Transport Studies,University of Leeds,34-40 University Rd,Leeds,LS29JT,UK

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第4期2009-2030,共22页岩石力学与岩土工程学报(英文)

基　　金：supported by the National Natural Science Foundation of China (Grant No.52108361);the Sichuan Science and Technology Program of China (Grant No.2023YFS0436);the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Independent Research Project (Grant No.SKLGP2022Z015).

摘　　要：Bedding parallel stepped rock slopes exist widely in nature and are used in slope engineering.They are characterized by complex topography and geological structure and are vulnerable to shattering under strong earthquakes.However,no previous studies have assessed the mechanisms underlying seismic failure in rock slopes.In this study,large-scale shaking table tests and numerical simulations were conducted to delineate the seismic failure mechanism in terms of acceleration,displacement,and earth pressure responses combined with shattering failure phenomena.The results reveal that acceleration response mutations usually occur within weak interlayers owing to their inferior performance,and these mutations may transform into potential sliding surfaces,thereby intensifying the nonlinear seismic response characteristics.Cumulative permanent displacements at the internal corners of the berms can induce quasi-rigid displacements at the external corners,leading to greater permanent displacements at the internal corners.Therefore,the internal corners are identified as the most susceptible parts of the slope.In addition,the concept of baseline offset was utilized to explain the mechanism of earth pressure responses,and the result indicates that residual earth pressures at the internal corners play a dominant role in causing deformation or shattering damage.Four evolutionary deformation phases characterize the processes of seismic responses and shattering failure of the bedding parallel stepped rock slope,i.e.the formation of tensile cracks at the internal corners of the berm,expansion of tensile cracks and bedding surface dislocation,development of vertical tensile cracks at the rear edge,and rock mass slipping leading to slope instability.Overall,this study provides a scientific basis for the seismic design of engineering slopes and offers valuable insights for further studies on preventing seismic disasters in bedding parallel stepped rock slopes.

关 键 词：Rock slope stability Shaking table test Numerical simulation Permanent displacement Acceleration amplification factor 

分 类 号：TU45[建筑科学—岩土工程] TU457[建筑科学—土工工程]