Model test and numerical simulation on the dynamic stability of the bedding rock slope under frequent microseisms  

作　　者：Deng Zhiyun Liu Xinrong Liu Yongquan Liu Shulin Han Yafeng Liu Jinhui Tu Yiliang 

机构地区：[1]School of Civil Engineering,Chongqing University,Chongqing 400045,China [2]National Joint Engineering Research Center for Prevention and Control of Environmental Geological Hazards in the TGR Area Chongqing University,Chongqing 400045,China [3]China Construction Underground Space Co.,Ltd.,Chengdu 610081,China [4]School of civil engineering,Chongqing Jiaotong University,Chongqing 400074,China

出　　处：《Earthquake Engineering and Engineering Vibration》2020年第4期919-935,共17页地震工程与工程振动（英文刊）

基　　金：National Natural Science Foundation of China under Grant No. 41372356;the College Cultivation Project of the National Natural Science Foundation of China under Grant No. 2018PY30;the Basic Research and Frontier Exploration Project of Chongqing,China under Grant No. cstc2018jcyj A1597;the Graduate Scientific Research and Innovation Foundation of Chongqing,China under Grant No. CYS18026。

摘　　要：Shake table testing was performed to investigate the dynamic stability of a mid-dip bedding rock slope under frequent earthquakes. Then, numerical modelling was established to further study the slope dynamic stability under purely microseisms and the influence of five factors, including seismic amplitude, slope height, slope angle, strata inclination and strata thickness, were considered. The experimental results show that the natural frequency of the slope decreases and damping ratio increases as the earthquake loading times increase. The dynamic strength reduction method is adopted for the stability evaluation of the bedding rock slope in numerical simulation, and the slope stability decreases with the increase of seismic amplitude, increase of slope height, reduction of strata thickness and increase of slope angle. The failure mode of a mid-dip bedding rock slope in the shaking table test is integral slipping along the bedding surface with dipping tensile cracks at the slope rear edge going through the bedding surfaces. In the numerical simulation, the long-term stability of a mid-dip bedding slope is worst under frequent microseisms and the slope is at risk of integral sliding instability, whereas the slope rock mass is more broken than shown in the shaking table test. The research results are of practical significance to better understand the formation mechanism of reservoir landslides and prevent future landslide disasters.

关 键 词：bedding rock slope frequent microseisms shaking table test numerical simulation dynamic stability failure mode long-term stability 

分 类 号：TU457[建筑科学—岩土工程]