基于RG法的空区群矿柱临界破坏条件研究

采空区群的稳定性对矿山的安全生产有重大影响,针对矿山采空区赋存形态,建立了对采空区群RG一维和二维模型,考虑应力重分布对系统稳定性的影响,将采空区群系统失稳破坏的复杂问题转换为了单元破坏失稳概率与临界失稳概率之间比较的问题,并给出了矿山采空区群一维和二维状态下的临界失稳概率,运用该方法对七角井铁矿采空区I和采空区II进行了计算验证,计算结果显示与实际情况较为符合,说明该方法对评价矿山采空区稳定性有一定的实用性。

Pillar Critical Failure Condition of Mined-out Zone Groups Based on RG Method

The mined-out zone groups have become one of the most potential safety factors for mines.In view of the mined-out zone′s occurrence，the RG one-dimensional and two-dimensional models were established.Considering the effect of stress redistribution on the stability of the system，the complex problem of the mined-out zone group system instability was transformed to the comparison between the unit instability probability and the critical instability probability.The critical instability probability of the mined-out zone groups under one-dimensional and two-dimensional conditions are put forwards.Mined-out zone 1 and 2 in Qijiaojing Iron Mine were calculated and verified by this method，showing that the calculation results are consistent with the actual situation.It is indicated that the method has a certain practicality to evaluate stability of mined-out zone. RG method|Mined-out zone group|Critical probability|Evaluation