某铅锌矿近地表采空区稳定性分析及治理方案优化

为了确保近地表采空区下部矿体开采安全,避免近地表采空区崩塌导致地表塌陷,将广西某铅锌矿现存的6个近地表采空区作为研究对象,针对可能出现的矿柱、顶板垮塌,展开基于数值模拟的稳定性分析及治理方案优化研究。根据该矿矿体及围岩的岩体力学参数,利用3DMine及Midas GTS NX建立数值模型,通过FLAC3D进行模型重构与计算分析,依据数值模拟分析结论及矿区实际情况,提出2种局部充填加固的治理方案,并利用FLAC3D对各方案的治理效果进行了模拟分析。结果表明:方案一及方案二均能达到转移或减小采空区矿柱及顶板相应的最大主应力、剪应力及拉应力的效果,同时减小塑性破坏区的面积;方案二的较大尺寸支护结构较方案一能更好地转移或减小顶板的最大主应力、剪应力,故确定方案二为最优方案。

Stability Analysis of Near-surface Goaf and the Optimization of Its Treatment Scheme in a Lead-zinc Mine

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.