厚大矿体充填开采地表稳定性分析

Research on Rock Movement Mechanism and Stability Analysis of Thick and Large Ore Body Filling Mining

某金属矿矿体特征为埋深浅的缓倾斜厚大矿体,矿岩节理裂隙发育,地表有公路和建构筑物存在,地下开采可能对矿区地表建构筑物和公路造成影响。为解决上述问题,本文优选大直径深孔侧向崩矿和底盘堑沟中深孔空场法的开采方案,利用FLAC^(3D)软件模拟分析了充填开采对矿山地表的移动和沉降机理变形规律,对比分析了充填及未充填下地表移动变形差异情况。研究表明,充填采矿法可使地表岩移趋近于连续变形和均匀下沉,有效增强矿山地表建构筑物的安全保护等级,具有可实施性。

The characteristic of a certain metal ore body is a gently inclined and thick ore body with shallow burial depth,developed rock joints and fissures,and the presence of roads and buildings on the surface.Underground mining may have an impact on the surface buildings and roads in the mining area.To solve the above problems,this article selects the mining schemes of large-diameter deep hole lateral collapse and deep hole open pit method in chassis trenches.FLAC^(3D) software is used to simulate and analyze the deformation laws of the mining surface movement and settlement mechanism caused by filling mining,and the differences in surface movement and deformation under filling and unfilled conditions are compared and analyzed.Research has shown that the filling mining method can make the surface rock move towards continuous deformation and uniform subsidence,effectively enhancing the safety protection level of mining surface structures,and has feasibility.