金川龙首矿下向进路充填采矿的进路稳定性分析

Analysis on the Drift Stability of Downward Drift Filling Mining in Longshou Mine

金川龙首矿地应力高,矿岩破碎,在工程支护困难的矿段采用下向分层六边形进路胶结充填采矿法,分层逐采。研究表明,稳定的六边形结构可有效避免应力在进路边缘集中。结合龙首矿1040水平的矿岩条件,使用FLAC3D对进路回采进行了数值模拟,分析进路采空区应力和位移在开挖过程中的变化,结合现场进路收敛变形监测,证实了六边形进路具有较好的稳定性。

Longshou Mine is of high ground stress and mine rock fragmentation.In the mining section where the engineering support is difficult,downward layered hexagon drift cemented backfill mining method was used.The study shows that the stable hexagon structure can effectively avoid the stress concentration at the edge of the drift.Combined with the rock conditions at 1040 level in Longshou Mine,FLAC3 D was used to carry out the numerical simulation on the drift stoping,and the changes of the stress and displacement of the goaf in the excavation process were analyzed.Combined with the monitoring of the convergence deformation of the field drift,it is confirmed that the hexagonal drift has good stability.