地下大跨度破碎站硐室稳定性可靠度分析

根据叠加压缩拱承载结构和围岩耦合的力学特点,基于极限平衡理论建立了高应力矿区大跨度硐室工程的可靠度分析模型,利用FOSM法确定了高应力大跨度硐室的可靠度指标。通过对金川矿区破碎站硐室施工特点、地质调查和岩石力学3方面变异参数的均值及方差的计算,得到适合该矿区的可靠度指标计算式,并对金川Ⅲ矿区破碎站硐室的可靠度指标计算,其最小值为1.137。假设影响破碎站硐室稳定性的随机变量服从正态分布,则可靠度指标和失效概率存在确定的关系。根据标准正态分布函数关系式可以计算得到硐室结构的失稳风险概率小于5.87%,即该硐室稳定性可靠度大于94.13%满足硐室稳定性要求。

Reliability analysis of large-span underground cavern stability

According to superposition compression arch structure and the interaction mechanical characteristics of cavern rock,a reliability analysis model of large-span cavern of a high-stress mine is set up on the basis of limit equilibrium theory.the reliability index of the large-span and high-stress cavern is determined by using first-order reliability method.The suitable Jinchuan Mine＇s reliability index calculation formula is obtained through the mean and variance calculations of three variations parameters-cavern construction features,geological survey and rock mechanics.Jinchuan Mine No.3 crusher cavern of the reliability index is calculated,the minimum value of 1.137.The reliability index and failure probability is existing definete relationship if the random variables of affecting crusher cavern stability is normal distribution,The failure risk probability of cavern structure is less than 5.87% according to the standard normal distribution function,and the stability reliability of the cavern is greater than 94.13% to meet the stability requirements cavern.