开采扰动下矿山地表沉降数值模拟分析研究

Numerical Simulation Analysis of Mine Surface Subsidence Under Mining Disturbance

地下开采扰动引起的地表沉降直接影响矿山的安全生产。为分析某铁矿井下开采过程对地表整体、尾矿库、充填站、道路、露天采场、无名沟等建构筑物稳定性的影响,通过室内试验及Hoek-Brown岩体强度准则确定岩体力学参数,并建立三维数值模型,利用FLAC3D对井下开采扰动下地表变形开展了仿真分析,获取了地表最大沉降位移、倾斜率、曲率、水平变形值等指标,结果表明:各个指标值均小于其规范允许值,整个地表均较为稳定、安全。

The surface subsidence caused by underground mining disturbance directly affects the safety production of the mine.In order to analyze the influence of underground mining on the stability of the whole surface,tailings reservoir,filling station,road,open pit,unknown ditch and other buildings and structures,the mechanical parameters of rock mass were determined by laboratory test and Hoek-Brown rock mass strength criterion.Then a three-dimensional numerical model was established,and the software of FLAC3D was used to simulate the surface deformation under the disturbance of underground mining.The maximum settlement displacement,inclination rate,curvature and horizontal deformation value of the surface were obtained.The results show that the values of all indexes are less than the allowable value of its specification,which indicates that the entire surface is relatively stable and safe.