某金属矿地下开采地表沉降对建构筑物安全分析

Safety analysis of ground subsidence on buildings and structures in underground mining of a metal mine

为确保地表移动监测范围内建(构)筑物的安全,同时尽可能的采出其下部有用的矿产资源,结合某金属矿的开采实例,采用FLAC 3D三维数值模拟软件,对“三下”开采矿山移动监测范围内的地表沉降进行模拟,并将模拟结果与《有色金属采矿设计规范》中的安全要求进行对比分析。研究结果表明:矿山-150~-50m水平矿体开采并充填完毕后,地表最大倾斜值为0.02573mm/m、最大曲率为0.000214×10-3/m、最大变形值为0.02550mm/m,满足建(构)筑物保护等级的要求;数值模拟得到的地表变形值与实际值基本吻合,说明采用FLAC 3D软件预测矿山开采对地表影响程度是可行的;由于充填法开采能有效减小采场附近围岩的应力与变形值,使得地表沉降大大减小,能够确保开采移动监测范围内建(构)筑物的安全,为类似“三下”开采矿山安全高效开采提供一定的借鉴价值。

In order to ensure the safety of buildings(structures) within the monitoring range of surface movement and extract useful mineral resources at the lower part as much as possible, combined with the mining example of an iron mine,FLAC 3D three-dimensional numerical simulation software is used to simulate the surface subsidence within the monitoring range of "three down" mining mine movement, and the simulation results are compared with the safety requirements in the code for design of nonferrous metal mining. The research results show that after the mining and filling of-150~-50m horizontal ore body in the mine, the maximum inclination value of the surface is 0.02573 mm/m and the maximum curvature is 0.000214×10-3/m, the maximum deformation value is 0.02550 mm/m, which meets the requirements of building(structure)protection grade;The simulated surface deformation value is basically consistent with the actual value, which shows that it is feasible to use FLAC 3D software to predict the impact of mining on the surface;Because filling mining can effectively reduce the stress and deformation of surrounding rock near the stope, greatly reduce the surface settlement, ensure the safety of buildings(structures) within the monitoring range of mining movement, and provide a certain reference value for safe and efficient mining of similar "three down" mining mines.