挂帮矿充填法开采对高陡边坡及采场围岩稳定性的影响

以大冶铁矿高陡边坡下2#挂帮矿回采为工程背景,首先采用GEO--SLOPE软件对挂帮矿开采中边坡稳定性进行了分析;然后通过现场监测及模型相似实验相结合的手段,研究矿柱及围岩的应力及位移变化规律,探讨了挂帮矿充填法开采对采场围岩稳定性的影响.研究表明挂帮矿所在露天初始边坡经过扩帮及内部开采后,安全系数平均值由1.274下降至1.005,边坡稳定性较差;目前空区采场矿柱及围岩稳定性较好,但必须对现有采空区进行充填,改变空区及矿柱应力集中状态,才能进行矿柱及顶底板矿石回采.

Effect of a filling method for mining the hanging wall ore on high-steep slope and surrounding rock stability

Taking the mining of the 2# hanging wall ore in Daye Iron Mine by a filling method as an engineering background,the change of high-steep slope stability in the mining process was analyzed first in this paper.Then through using on-site monitoring together with similar material simulate experiments,the stress and displacement changing rules of rock pillars and surrounding rock were studied to discuss the effect of mining the hanging wall ore using the filling method on the surrounding rock stability.The results show that the average value of slope safety coefficient decreases from 1.274 to 1.005 after slope expansion and mining.This indicates that the slope stability is poor.Although the rock pillars and surrounding rock are stable currently,the existing mined-out areas must be filled to change the stress concentration state before the mining of pillar ore and the roof & floor ore.