| Earthquakes occurs intensely in southwestern China,which cause a serious damage to highways,and railways.Slope instability caused by earthquakes is very common.Lijiang-Shangri-La Railway is located in Zhongdian-Dali seismic control tectonic zone which is characterized by strong seismic activity and high frequency.The Jinsha River Bridge is a controllable project of Lixiang Railway,therefore,the stability and dynamic response of the bank slope are the prerequisites for railway operation.In this paper,Geostudio software and FLAC3 D numerical simulation software are used to study the stability and dynamic response of Shangri-La bank slope of Jinsha river Bridge on Lixiang Railway under earthquake activity.The main research results are as follows:(1)In natural state,bank slope is stable with a stability coefficient of 2.53.Under the intensity of ????? earthquakes,the bank slope stability coefficients are 2.25,2.02 and 1.68,respectively by quasi-static method.(2)In this paper,the Kobe earthquake is selected as input seismic wave,and the stability coefficient of bank slope under seismic load is 1.69 simulated by FLAC3 D software.It shows that the stability coefficient of bank slope decreases under seismic load,but it has not reached failure.(3)In this paper,the distributions of displacement,velocity,acceleration,stress and plastic zone of bank slope are simulated.The lower part of the bank slope is compressed and the rock mass at the back edge is deformed greatly.Earthquake permanent displacement is caused by shear plasticity at the top.And acceleration increases with elevation.(4)The dynamic response characteristics and dynamic change trend of pile foundation on both sides and tunnel anchor on both sides are basically the same.However,The displacement on the right side is slightly larger than that on the left.The velocity distribution is more uniform and they all have amplification effect of earthquake acceleration. |
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