Dynamic Response Of Slope Under Earthquake Load And Stability Analysis Of Slope Strengthened By Anti Slide Pile

China is located in the Pacific Rim Seismic Belt and Eurasia Seismic Belt between the frequent seismic activities,resulting in many secondary disasters,slope instability is a relatively large part of the secondary disasters.Especially for Tibet in China,frequent earthquakes,fragile geological environment and lack of slope protection engineering pose a great threat to the local economic development and the personal and property safety of residents..In this paper,ABAQUS software is used to establish a soil slope.In order to eliminate and weaken the influence of seismic wave reflection and refraction,the viscoelastic boundary is applied to the slope boundary,and the seismic load is applied to the boundary in the form of equivalent nodal force.Analyses its influence from two aspects of external cause and internal cause.The external cause mainly studies the influence of ground motion load,and analyzes the influence of ground motion parameters(amplitude,frequency,holding time)on the dynamic response of the slope.The internal cause mainly analyzes the physical parameters of slope soil and slope Angle.Then a homogeneous three-dimensional slope was established,and the influence of anti-slide pile position and pile section shape on slope stability was analyzed by strength reduction method and slope displacement and plasticity nephogram.The main work and achievements are as follows:(1)Study the influence of external causes of slope instability.By simulating the dynamic response of the slope under different ground motion parameters(amplitude,frequency and holding time),the impact of ground motion parameters on the dynamic response of the slope is analyzed from four aspects of slope acceleration,velocity,displacement and strain.(2)The internal causes of slope instability were studied.By simulating the shear strength parameters of different soils and the dynamic response of the slope under the slope Angle,the influences of the shear strength parameters of soils and the slope Angle on the dynamic response of the slope were analyzed from four aspects of slope acceleration,velocity,displacement and strain.(3)The strength reduction method and numerical simulation are used to calculate the safety factor of anti-slide pile slope with different pile positions and different pile section shapes,and the influence of pile positions and section shapes on the stability of anti-slide pile slope is obtained through comparative analysis.