Research On The Stability Of Rock Pit Slope Of Qi Yun Mountains Based On Interval Non-reliability Theory

Due to long-term quarrying activities,there were several mines in the area of Qinhuangdao Qiyun Mountains,with high surface elevation,bedrock as mixed granite and joint development.In order to ensure the safety of personnel and building in the pit area,the stability of the mine pit needs to be evaluated.This paper established the non-probabilistic reliability analysis model based on the interval theory of the slope in Qiyun Mountains mine in Qinhuangdao to evaluate the stability of the slope.According to the limit equilibrium method and the finite element analysis method,the non-probability reliability model of the slope is established.The value range of rock mass parameters is determined by the equivalent M-C strength criterion of H-B rock mass strength criterion,and the fracture degree and joint development of rock mass can be considered.According to the calculation results of the safety factor and the non-probabilistic reliability index,the unstable slope is respectively adopted by the way of anchor reinforcement and the method of cutting the slope so that it can reach a safe state.Considering the influence of different parameters of rock and soil parameters on the position of the sliding surface of the slope,the effect of rock mass on the non-probabilistic reliability of the slope was analyzed using the finite element method,the Swedish slice method,and the simplified Bishop slice method.It was shown that the variability of the rock and soil parameters is not conducive to the stability of the slope.Among them,the variability of rock mass cohesion has the most significant effect on the slope stability,followed by the internal friction angle,and the least influence is the rock and soil weight.According to the results of the analytic hierarchy process,the rock weight weight is 12.74%,the cohesion weight is 54.95%,and the internal friction angle weight is 32.31%.