关键词: 采空区, 稳定性分析, 治理方案, 数值模拟

Abstract: In order to ensure the safe mining of the lower ore body in the near-surface goaf， and avoid surface subsidence caused by the collapse of near-surface goaf， six near-surface goafs existing in a certain Lead-zinc Mine in Guangxi were taken as the research object to investigate the stability analysis on the pillar and roof that possibly collapse based on numerical simulation and optimize the related treatment schemes. According to the rock mechanics parameters of the ore body and the surrounding rock， a numerical model was established using 3DMine and Midas GTS NX， and the model was reconstructed and calculated by FLAC3D. According to the conclusion of numerical simulation analysis and the actual situation of mining area， two kinds of treatment schemes were proposed， and FLAC3D was used to simulate and analyze the governance effect of each scheme. Results showed that the scheme one and two transferred or reduced the related maximum principal stress， shear stress and tensile stress at the goaf pillar and the roof， and narrowed the plastic area；the large size supporting structure at scheme two can better transfer or reduce the maximum principal stress and shear stress of roof than the scheme one， thus finally determining the optimal treatment schemes.

Key words: Goaf, Stability analysis, Treatment scheme, Numerical simulation