冬瓜山铜矿高大采场二步骤回采顺序优选研究

Study on Optimization of Two-step Mining Sequence for Big and Tall Stope in Dongguashan Copper Mine

随着冬瓜山铜矿深部开采的推进,地压显现导致围岩变形严重,空区垮落现象凸显,制约着矿山的安全高效生产。矿山采用阶段空场嗣后充填采矿法,一步骤回采矿房采用单向逐步回采方案,但一步骤回采后空区垮落严重。为验证二步骤回采矿柱时原先回采方案的安全性,本研究在单向逐步回采方案的基础上提出中间向两侧回采、回采一半充填后再回采两种方案,利用FLAC^(3D)模拟不同方案下的回采过程。结合模拟云图分析采场应力、位移情况,优选出最佳的采场回采顺序,对同类型工程地质条件矿山的开采具有一定的借鉴意义。

With the advancement of deep mining of Dongguashan Copper Mine, the emergence of ground pressure has resulted in serious deformation of surrounding rocks and prominent gob caving, restricting the safe and efficient production of the mine. The mine adopts mining method of sub-level open stoping with subsequent backfilling, and the one-step room extraction adopts one-way step-by-step extraction scheme, but gob caving is serious after the one-step extraction. To verify the safety of the original mining scheme during the two-step pillar recovery, this study proposes two plans based on the one-way step-by-step mining scheme: extracting from the middle to both sides, and extracting again after backfilling following a half extraction. The finite element simulation software FLAC3 D is used to simulate the recovery process under different schemes. By using the simulated cloud map to analyze the stress and displacement of the stope, optimal stope mining sequence is chosen, which still adopts the one-way step-by-step extraction. This has certain reference significance for the exploitation of mines having the same type of engineering geological conditions.