Reliability Analysis of Slope Stability Based on Factors Sensitivity
XU Bo-hou · Zhongguo gonglu xuebao · 2012
In order to evaluate the influence of factor sensitivity on slope stability reliability,aimed at plane shear slope which is most common in rock slope,based on the safety factor of slope stability obtained by fixed value method and using single factor analysis,range analysis and variance analysis methods,comparative sensitivity analysis of slope geometry and physical mechanics parameters was carried out.For several combinations of random variables with different sensitivity,analysis of slope stability reliability was carried out by Rosenblueth method.The results show that single factor analysis,range analysis and variance analysis can obtain consistent sorting of parameter sensitivity,and the result of variance analysis has maximum dispersion degree,so variance analysis is the best;on the assumption that the variability of parameters is the same,the higher sensitivity level of factors selected as random variables,the larger failure probability;for factors with larger sensitivity,whether they are strength parameters or geometric parameters,if there is variability,their influence on the analysis of slope stability reliability cannot be ignored,otherwise they will produce significant effect on the result;before the analysis of slope reliability,firstly determining the sorting of parameter sensitivity,and choosing random variables according to the variability of parameters,the results will be more reasonable.