南非Dilokong铬矿采场结构参数优化

Stope Structure Parameters Optimizing on Dilokong Chromium Mine in South Africa

南非Dilokong铬矿矿体含铬品位较高,为典型的缓倾斜薄矿体,设计采用房柱采矿法进行回采。针对Dilokong铬矿缓薄矿体的开采技术条件及采矿难题,为探求其合理的采场结构参数,实现现场的安全、高效开采,研究采用正交数值模拟试验,选取了矿房长度、矿房跨度、点柱尺寸和点柱间距4个因素,正交设计了4因素3水平9种采场结构参数模型的试验方案。通过FLAC3D软件对不同方案的围岩应力及位移分布数值模拟结果的对比分析,研究各参数对采场稳定性的影响及优化采场结构参数。试验结果表明,矿房跨度及点柱尺寸是影响采场应力集中和位移变形的重要参数,并确定了合理的采场结构参数,即矿房长度50 m、矿房跨度26 m、点柱尺寸5 m×5 m及点柱间距2 m,研究结果对现场下阶段矿体的回采具有指导借鉴意义。

Dilokong Chromium Mine in South Africa is a high grade deposit and it is the typical gently inclined thin bodies,the room-and-pillar stoping mining method was adopted.According to the mining conditions of gently inclined thin Chrome ore body and current mining problem of Dilokong chromium mine,in order to get the reasonable structure parameters and achieve safe ＆ efficient mining,the paper adopted orthogonal numerical simulation experiments,which selecting four parameters including room length,room width,pillar dimension and pillar spacing,and orthogonally designed nine feasible stope structure models with four factors and three levels.Through FLAC3D simulation results comparing of stress status and surrounding rock displacement of different structure parameter schemes,the paper had studied influence of different parameters to stope stability and optimized stope structure parameter.The research result showed that room width and pillar dimension were the important influence parameters of stress concentration and displacement deformation,and the reasonable stope structure parameters were determined：the length of room is 50 m,the width of room is 26 m,the dimension of pillar is 5 m × 5 m and the spacing of pillar is 2 m.The results will guide a significance to next mining of Dilokong Chromium Mine.