铜绿山矿深部矿床上向分层开采采场结构参数优化

Optimization of Stope Structural Parameters of Upward Layered Mining in Deep Mineral Deposits in Tonglushan Mine

确定合理的采场结构参数是安全高效地开采深部矿床的难点问题。为研究其影响机制,以铜绿山矿ⅩⅢ号矿体的深部开采为研究目标,选取深部典型矿岩进行岩石力学参数测试,基于岩体RMR分级结果、经验公式以及经验系数,得到区域内岩体力学参数;针对影响采场结构的3个主要因素,设计9组正交试验,运用FLAC3D数值模拟,结合每分层可采矿量,对比分析竖直位移分布、水平位移分布、塑性区域分布、最大主应力分布等力学响应指标。结果表明:在中段埋深一定的条件下,矿房宽度10 m,矿柱宽度8 m,分层高度5 m为适宜采场结构参数。

Determining the reasonable stope structural parameters has been an important issue for mining deep deposits efficiently and safely.Taking the deep exploration of Tonglushan XIII ore body as the research target,the typical deep rocks are selected to investigate rock mechanics parameters.Based on the rock mass RMR grading results,empirical formula and empirical coefficient,the rock mechanical parameters in the region was obtained.Considering the three main controlling factors affecting the stope structure,nine sets of orthogonal contrast experiments is designed. With the use of FLAC3 D,and combining with the workable deposit of each layer,such mechanical response index as the vertical displacement distribution,the horizontal displacement distribution,the plastic area distribution,and the maximum principal stress distribution are contrasted. The results show that with a certain of buried depth in the middle section,the optimal stope structural parameters are the room width 10 m,the pillar width 8 m,and the layer height 5 m.