三山岛金矿断裂带矿床开采的稳定性分析

Stability Analysis of Ore Mining at Fault Zone in Sanshandao Gold Mine

借助三维地质建模软件GDCAD建立仿真模型并进行网格划分,将节点及单元信息导入FLAC^(3D)中对开采全过程进行数值模拟计算,分析断裂带的长度及断裂带与矿体之间的距离对矿体开采稳定性的影响。结果表明:断裂带与矿体之间的距离近时,矿区上部基岩沉降量为8 cm,间柱底面应力高达17 MPa,间柱及顶间柱的剪切破坏覆盖面积较大;相比之下,断裂带与矿体之间的距离较远时稳定性较高;断裂带较短时,应力集中于断裂带与矿体之间的上部岩体,矿区上部基岩沉降量及间柱底面应力都较小。为矿山不同工况下的间柱及顶间柱的设计与施工提供了依据和指导,同时也为设计监测方案提出了可行性建议。

The simulation model was established by three-dimensional geological modeling software GOCAD,and the mesh partition is made. The node and unit information were introduced into FLAC^（3D）to make numerical simulation on the whole process of mining. The effect of the length of the fault zone and the distance between the fault zone and the ore body on the stability of the ore body mining was analyzed. The results show that when the distance between the fault zone and the ore body is short,the settlement of the upper bedrock is 8 cm,the stress between the bottom of the rib pillar is as high as 17 MPa,and the coverage of shear failure between the rib pillar and top pillar is large; In contrast,when the distance between the fault zone and the ore body is longer,its stability is higher; When the fault zone is short,the stress concentrates on the upper rock mass between the fault zone and the ore body,the settlement of the upper part of the bedrock and the stress between the bottom of the rib pillar are smaller. The analysis provides the basis and guidance for the design and construction of the rib pillar and the top pillar under different working conditions. At the same time,some feasible suggestions for setting up the monitoring program are put forward.