Stability Analysis Of Slope Progressive Failure Under Earthquake

China is a country with frequent earthquakes.Since the 20 th century,there have been many strong earthquakes.According to the analysis of earthquake frequency and intensity in recent decades,the earthquakes in China are mainly concentrated in the central and western regions,with shallow source,high intensity and increasing frequency.As a mountainous country,there are a large number of natural and artificial slopes,especially in the southwest.These slopes are prone to instability under seismic loading.Once a landslide occurs,it will cause a large number of casualties and property losses.Therefore,the study of slope stability under earthquake has important theoretical significance and research value.The main research work of this paper is as follows:(1)The analysis method of slope progressive failure stability under static action and earthquake action is analyzed.The existing dynamic response mechanism of slope is summarized,and the advantages and disadvantages of each method are analyzed to provide reference for the research.(2)The basic idea,equilibrium condition and displacement calculation method of the general continuum medium slope theoretical solution are proposed.A new joint constitutive model is introduced to establish the stability evaluation standard of geological material unit based on stress and strain,and the slope based on stress and strain is created.The overall stability evaluation method is used to analyze the slope stability under static action(providing a reference for the slope stability analysis under the earthquake)and determine the safety factor of the slope.The effects of cohesion and internal friction angle on the stability of slope are studied,and the stress,strain and displacement laws of the slope are obtained.(3)Based on the theoretical solution stability analysis method of slope stress-strain under earthquake action,the slope failure characteristics under seismic force are analyzed,the safety factor of slope under seismic wave is determined,and the displacement-stress-strain distribution characteristics of slope are studied under seismic loading..Compared with the self-weight effect,the safety factor of the slope is reduced under the action of earthquake,the displacement is increased,and it is more unstable.(4)A new method of landslide stability analysis is proposed.This method can solve the problem that the result is not true due to the strength reduction in the ordinary strip method.The new method is to directly study the mechanical properties of the divided strips and combine them with new ones.Joint constitutive model for analyzing landslide stability.(5)Combined with the actual engineering,the new strip method(ideal elastoplastic model and new shear stress constitutive model)and theoretical solution method are used to analyze the stability of Huangjingshu landslide under earthquake action.At the same time,the finite element software ANSYS is used to simulate and analyze the Huangjingshu landslide.The deformation and stress conditions under the action of peak acceleration are compared.The results of the stability analysis obtained by the theoretical solution are more realistic and reliable.The slope is more displaced and the slope is progressively damaged.