基于一次二阶矩理论中心点法的深部软岩巷道稳定性分析

Surrounding Rock Stability in Deep Mine Soft Rock Roadway Based on Central Point Method of the First-order Second-moment Theory

针对深部煤矿软岩巷道稳定性控制问题,利用数理统计和概率论的方法,以支护抗力和围岩荷载为变量,建立了可靠性极限状态方程,并采用一次二阶矩理论中心点法计算出支护失效概率指标,对支护后的软岩巷道围岩稳定性进行了可靠性预测,分析了巷道支护稳定性,并借助数值模拟,进一步验证了该方法的可行性。从现场施工至今,巷道围岩没有出现较大变形,生产情况良好,说明该法计算出的较小失效概率在工程允许范围内,完全符合预测要求。

Based on the method of statistics and probability, the stability and control question in deep mine soft rock roadway was studied and the reliable limit state equation by the variables of support resistance and surrounding rock pressure was established. The failure probability index of support was calculated by using the central point method of the first-order second-moment theory, and the reliability of surrounding rock stability for the supported soft rock roadway was forecasted and the supporting stability of rock way was analysed. With simulation data, the paper made further verification for the feasibility of this method. The field construction was given constant monitor, which showed a sound operation of working well on roadway surrounding with no large deformation. This proves that smal ler failure probability by calculating meets engineering demand,completely satisfying forecasting requirements.