Sensitivity analysis of landslide stability based on distribution models of influencing factors

The sensitivity analysis method of landslide stability based on models of influencing factors is conducted to analyze sensitivities of influencing factors in their definition domains. This method regards influencing factors as sub-sequences, the corresponding safety factors as target-sequences. The area probability functions of influencing factors, which are calculated by cumulative distribution functions of sub-sequences, product with difference values of target-sequences respectively; then, results that are produced by those two values are summed to get decision values of sensitivity. With this method, taking Taishanmiao landslide for example, which is located at Fengjie county in the Three-Gorges reservoir. Based on the distribution functions of shear strength factors by analogy and statistics and the ones of maximum horizontal acceleration of earthquake and water level fluctuations by empirical analysis, the most sensitive factor among all influencing factors is obtained. Finally, the relation between the sonsitivity of landslide stability and variances of influencing factors is analyzed on basis of internal friction angle.