某大理岩矿山采空区稳定性评价与综合治理对策研究

某大理岩矿山采用房柱法进行开采,遗留了大量尚未充填的采空区,成为矿区及周边地区重大的安全隐患。基于采场的三维模型,选取代表性区域建立数值计算模型,利用FLAC_^3D软件进行稳定性分析。模拟结果表明,塑性区破坏以剪切破坏为主,仅存在于?90 m水平采空区拐角处,未贯通且分布范围有限,其影响深度约向围岩内部深入0.4～1.0 m,说明岩体的破坏发生在浅层,采空区不会发生大规模失稳,整体稳定性良好；结合模糊综合评判,将采空区按照稳定性划分为稳定性良好、较稳定和较不稳定三类区域。在此基础上,提出了四种采空区综合治理方案,并从方案的技术可行性、经济性和治理效果进行分析对比,确定方案一为首选方案。从而为采空区治理和综合利用、城市发展规划提供依据。

Study on stability evaluation and comprehensive treatment of goaf for a marble mine

A large number of unfilled goaf is left in a marble mine used room-and-pillar method, which has become a major safety hazard in the mining area. Based on the 3D model of stope, a representative region is selected to establish the numerical calculation model, then the stability analysis is carried out by FLAC_^3D software. The results show that the mode of plastic zone is mainly shear failure, in addition, it is in limited range and not run-through. In other words, the failure of rock mass occurs in the superficial layer and the overall stability of goaf is good. Combined with the fuzzy comprehensive evaluation, the stope is divided into three areas according to the stability, which are good stability, relatively stable and relatively unstable areas respectively. On this basis, one of the four comprehensive treatment schemes is selected through comparison of feasibility, economy and treatment effect. This study provides a reference for stability evaluation, comprehensive treatment of goaf and urban development planning.