摘要
以无底柱分段崩落法为研究对象,采用颗粒流数值模拟软件PFC^(2D)研究了在大量放矿时采场底部及侧壁突发的高动态应力变化规律,并通过两种不同的回采顺序对放矿时放矿口附近的压力增高区、压力降低区范围的变化进行了模拟分析。结果表明:随着放矿的进行其侧壁压力峰值逐渐增大,顶部压力降低区的范围随着工作面的推进逐渐减小,直至消失。两翼向中间回采时采场底部将产生应力集中,其采场底部压力将远大于一翼向另一翼回采。
Sublevel pillarless caving as the research object, using particle flow numerical simula-tion software PFC^2D study a large amount of ore drawing tope bottom and sidewall dynamic pressure change rule, and by two different stoping sequence of ore drawing simulated analysis the change of the pressure reducing area and higher pressure area. The results showed that： with the ore drawing to the wall pressure peak value increases gradually, at the top of the pressure to reduce the scope as the working face advancing gradually decreases, and until it disappeared. Two wings to the middle of the bottom of the stope will produce stress concentration, the stope bottom pressure will be grea-ter than the wing to another wing of extraction.
出处
《矿产保护与利用》
北大核心
2017年第2期25-29,共5页
Conservation and Utilization of Mineral Resources
