“多米诺骨牌”破坏现象下的矿柱群系统可靠度评价

Reliability Evaluation of Pillars System Based on Domino Failure Effect

采矿作业后残留的采空区对地下作业和地表建筑安全造成极大威胁,开展采空区系统的稳定性评价,有助于指导正常生产并预防灾害的发生。从矿柱"多米诺骨牌"级联破坏现象出发,构建并联矿柱承载模型。对矿柱强度进行估算,建立矿柱群系统承载力的极限状态方程。以某铬铁矿为例,基于Monte-Carlo模拟方法评价不同安全系数标准下矿柱群系统的稳定性,结果表明矿柱群的失效概率远大于失效标准,与矿山实际坍塌相符。在此基础上,研究发现矿柱承载力和矿柱数量是影响矿柱群系统稳定的主要因素。

The residual goafs after mining operations is a great threaten to underground work and surface building safe. Stability assessment on goafs system helps to guide normal production and prevent disasters. According to pillars’domino effect,multiple pillars system was constructed,based on which plliars’strength was calculated and the limitation state equation was proposed. The system’s stability under criteria with different safety factors was estimated by Monte-Carlo simulation method. In a chromite mine,failure probability of multiple pillars system was much higher than failure criteria,which corresponds to the realistic failure.The stability of pillars system was greatly influenced by both pillar bearing capacity and pillar number.