Research On The Evaluation Method Of Landslide Stabilitv With Considering The Influence Of Seepage And Earthquake

Landslide is one of the most common geological disasters,and rainfall and earthquake are the most important inducements.Therefore,researching the actions of unstable landslide due to rainfall and earthquake,and putting forward the corresponding targeted landslide prevention measures is very necessary.With Xiao Wan landslide in Yun Nan province as the research object,the thesis mainly studies the stability of the Xiao Wan landslide under the natural condition,different intensity of rainfall condition and the earthquake condition.The content of the thesis is listed as follows:(1)With the landslide model setting up with Xiao Wan landslide geological data,Xiao Wan landslide stability is analyzed under a variety of working conditions;(2)Combined with the evaluation about the saturation degree of soil in landslide and the minimum average stability coefficient method,the landslide stability under rainfall and seismic was analyzed;(3)By common parameters sensitivity methods,the landslide parameters sensitivity is calculated,and the error of calculation result was analyzed and corrected;(4)The landslide stability was also calculated by finite element limit equilibrium method,and the results was compared with results which was calculated by the traditional limit equilibrium method.The researching results show as follows:(1)When rainfall events,if the rain has not yet been drained out and water is formed in the landslide,the water can lead to landslide stability further reduced;(2)The earthquake peak acceleration is an important factor which influences the stability of landslide under the earthquake,but not the only one;(3)The stability factor of drawing rate-rate curve which was based on sensitivity coefficient method can help to determine the size of the parameter sensitivity,whose result is fast,intuitive and reasonable;(4)Compared with the traditional limit equilibrium method,the results of finite element limit equilibrium method which is based on finite element are more sensitive,and they can conform to the different accuracy requirements;(5)The point stability coefficient method which is used to draw the situation of the landslide stability is reasonable,which can also be used to determine volatile regions of the landslide.