采空区稳定性评价的综合指数法

房柱法开采容易造成采空区失稳事故。考虑地质条件和开采技术条件因素在采空区灾害形成过程中的作用,利用综合指数方法建立了房柱法开采形成的采空区危险源的分级评判模型;根据某石膏矿具体情况,采用综合指数分级法对其大面积采空区失稳的危险性进行了综合评价,求解出用于评价该石膏矿空区失稳危险程度的综合指数W和危险性等级,并把该评价结果与基于二维离散单元法的数值计算模拟结果进行了对比分析。研究结果表明:该采空区稳定性评价方法评价结果与实际情况吻合较好。

Comprehensive Index Method in Goaf Stability Evaluation

Room and pillar mining easily results in the accidents of instability of mined-out area.On this basis,considering the influences of natural geological conditions and mining technological conditions on the instability of the mined-out area,the comprehensive index method is used to establish the model of goafs hazard classification evaluation caused by the room and pillar mining.According to the specific situation of the gypsum mine,by using the method of comprehensive index of classification,the widespread mined-out area instability risk is evaluated.The comprehensive index W and risk level of the gypsum mine of widespread mined-out area instability risk rating are obtained.Comparing to the evaluation result and the numerical simulation result based on two-dimensional discrete element method,the results show that the evaluation results of mined-out area stability are in good agreement with the actual situation.