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APPLICATION OF RELIABILITY THEORY TO BACK ANALYSIS OF ROCKY SLOPE WEDGE FAILURE

SUN Lichuan1,WANG Hongxian1,ZHOU Nianqing2,NING Baoyi1(1.Nuclear Industry of China Geotechnical Engineering Co.Ltd.,Shijiazhuang,Hebei 050021,China;2.Department of Hydraulic Engineering,Tongji University,Shanghai 200092,China)  
The method of back analysis targeted on factor of safety and failure probability is introduced on the basis of reliability theory.According to the limit state function of wedge failure,Monte Carlo method is applied to back analysis of wedge failure of foundation pit slope in a nuclear power engineering.The limit state of failure slope is represented by failure probability.It is found that the back analysis method targeted on failure probability is more proper and reasonable than that targeted on critical factor of safety,for the latter has some deficiencies.Combined with case study,the effects of variation factor of cohesion and internal friction angle,truncated location,and correlation coefficient on the results of back analysis are discussed.The results show that the shear strength of structural surface obtained by back analysis is more realistic,and it can guide engineering practices.
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