Numerical Simulation of Surface Subsidence Induced by Underground Mining

Based on in-situ investigation of rock mass macrostructure and indoor rock mechanical experiments in Wudaoyangcha Mining Area, the surface subsidence deformation induced by mining in mining area is studied by FLAC finite-difference method. Based on simulation results, the characteristics of surface deformation and rock mass movement in five sub-mining areas under different mining techniques were obtained. According to the analysis and determination of subsidence threshold, subsidence boundary of the five sub-mining areas is delineated, and the corresponding subsidence volume is calculated as well.