Sensitivity Analysis Of Factor Of Soil Slope Stability In Seismic Action

China is a country where there are many seismic and geological disasters, and slope instability is a common geological disasters. Strong seismic action can induce a large number of slope instability so that lead to serious geological disasters. Landslide and collapse of slope which is induced by earthquake have the character of large quantity and scale, strong suddenness and destructiveness, and are important reasons of serious seismic disaster in China. We need to estimate the stability of slope under seismic action in many works such as engineering earthquake protection. So, it is important to analysis the key factors and the sensitivity of factors of slope stability. In this paper, we analysis and research the sensitivity of slope stability under seismic action,and the main results are as follows.(1) We have reviewed the research progress about sensitivity analysis of factors of slope stability, and cleared the engineering purpose and meaning of sensitivity analysis of factors, and presented the method of sensitivity analysis which is adopted in this paper. They include single factor sensitivity analysis of sensitivity coefficient, single factor sensitivity analysis of sensitivity gradient, and multi-factor sensitivity analysis of orthogonal test.(2) We have discussed the basic principle of strength reduction method of pseudo static force, and discussed the solving process of slope stability based on FLAC software system combining with numerical simulation software FLAC.(3) We have analyzed the sensitivity of slope stability under the condition of a certain earthquake acceleration, by using numerical simulation software FLAC, through the method of single factor sensitivity analysis. The results show that the sensitivity of various factors is slope high>slope angle>soil cohesion>soil weight> internal friction angle, when earthquake acceleration levels are 0.03 g, 0.05 g, 0.1g, 0.1 5g, 0.2g and 0.3g. The sensitivity of various factors is slope high>soil cohesion>slope angle>soil weight> internal friction angle when earthquake acceleration levels are 0.4g and 0.8g.(4) We have analyzed the sensitivity of slope stability under the condition of a certain earthquake acceleration, by using numerical simulation software FLAC, through the method of multi-factor sensitivity analysis. The results show that the sensitivity of various factors is slope high>slope angle>soil cohesion>internal friction angle>soil weight, when earthquake acceleration levels are 0.05 g and 0.1g. The sensitivity of various factors is slope high>slope angle>soil cohesion>soil weigh--t>internal friction angle, when earthquake acceleration levels are 0.15 g and 0.2g. The sensitivity of various factors is slope high>soil cohesion>slope angle>soil weight> internal friction angle, when earthquake acceleration levels are 0.3g and 0.4g.(5) We have compared the results of single-factor sensitivity analysis method and multi-factor sensitivity analysis method, and analyzed the reason of difference which is derive from these two methods. We have put forward the primary reference solution of comprehensive evaluation about slope stability.