极分散深部矿体开采对地表及建构筑物的影响分析

地下矿山大规模开采会对周围岩体造成扰动,会出现围岩的变形、开裂或者移动,逐渐对地表及其建构筑物造成威胁。以张家岭整合矿区深部大规模开采对地表及其建构筑物的稳定性影响为研究背景,通过辨识得到张家岭整合矿区影响范围内主要建构筑物的保护等级,进而分析影响地表变形的主要因素,结合实际工程地质条件,采用数值模拟方法,利用3Dmine-FLAC_3^D联合建模分析方法,对张家岭整合矿区深部矿体一期及二期开采后,地表变形及地表构建筑物稳定性进行分析。计算结果表明：一期开采地表移动变形较小,随着二期开采的展开,地表最大竖直位移及最大水平位移逐步增大,其中地表最大沉降为10mm；分析在深部开采结束后, G206国道、尾矿库、竖井、村落、诸河流的地表倾斜、地表曲率及地表水平变形值均满足相关规范要求,因此得出张家岭矿区地下开采对该区域的地表变形影响较弱。

Analysis of influence of mining of extremely dispersed deep orebodies on surface and structures

Large-scale underground mining will cause disturbance to the surrounding rock mass, and deformation, cracking or movement of surrounding rock will occur, which will gradually threaten the surface and its structures. Taking the influence of deep large-scale mining on the stability of the surface and its structures in the Zhangjialing Integrated mining area as the research background, the protection levels of the main structures within the influence range of the Zhangjialing integrated mining area are identified, and then the main factors affecting the surface deformation are analyzed. Combined with the actual engineering geological conditions, numerical simulation is adopted. Using 3Dmine-FLAC3D joint modeling and analysis method, the surface deformation and surface structure stability after the mining of the first and second deep ore bodies in Zhangjialing integrated mining area were analyzed. The calculation results show that the surface movement deformation is small in the first phase of mining. With the development of the second phase of mining, the maximum vertical displacement and maximum horizontal displacement of the surface increase gradually, and the maximum surface settlement is 10mm. After deep mining, the surface inclination, surface curvature and surface horizontal deformation values of G206 National Road, tailings reservoir, shaft, village and river all meet the relevant standard requirements, so it is concluded that underground mining in Zhangjialing mining area has a weak influence on surface deformation in this region.