闭坑矿山多层空区消纳盾构渣土稳定性分析

Stability Analysis of Multi-layer Goaf During Consuming Residue Soil in a Closed Mine

为确保由石材厂改造建成的渣土消纳场的安全运行,利用有限元分析软件FLAC^(3D)对原石材厂开采过程进行数值模拟,综合分析地下采空区对地表房屋及消纳作业场所的影响。结果表明:采空区顶板位移沉降量较小,大部分顶板围岩拉应力为0.1~0.13MPa,大面积受拉破坏可能性小,但可能出现局部冒落现象;采空区上方岩体移动范围影响至地表,最大位移发生在6号采空区的顶板位置,处于目前消纳场作业区域,采空区上方地表位移3~4 mm。渣土浆充填入采空区后将改善采空区的稳定性,对地表房屋及渣土车作业场所影响较小。

In order to ensure the safe operation of the residue soil consumption field reconstructed by a stone factory, the finite element analysis software FLAC3D was used to simulate the mining process of the stone factory. Then, the impacts of the un- derground goal on houses on the surface and residue soil consumption field were analyzed comprehensively. The results showed that the roof displacement of the goat＇ decreased slightly, the tensile stress of most surrounding rock on roof were 0.1-0.13 MPa, the tensile failure possibility of large-scale area was small, but the local falling might occur. The movement range of the rock mass above the goaf could affect to the surface. And the maximum displacement occurred on the roof of No.6 goaf, which was located in the operation area of residue soil consumption field. Else the surface displacement above the goal was 3 to 4 mm. In general, filling the residue soil into the goaf could improve the goaf stability, which also had small impacts on houses on the surface and the operation area of residue soil vehicles.