地应力作用下采场动静稳定性数值模拟研究

Numerical Simulation of Static and Dynamic Stability of Stope Under In-situ Stress

为研究地应力作用下地下金属矿山采场不稳固现象及灾变机理,以云南狮子山铜矿16中段29-38^(#)采场为研究对象,数值模拟并分析了采后结构的静力稳定性以及地应力-爆破耦合作用下的动静稳定性。结果表明,矿柱邻近大补偿空间区域应力集中程度最高,为最危险区域;采场围岩损伤为较高应力集中下地应力-爆破应力波耦合作用的结果,大补偿空间爆破开挖是采场不稳定的直接原因。为提高采场结构稳定性,应尽量减小补偿空间尺寸,并尽可能将补偿空间均匀布置于矿房之内。

In order to study the instability phenomenon of stope and mechanism of catastrophic incident under in-situ stress in the underground metal mines,the stope 29-38^(#)at 16 middle level in Shizishan Copper Mine in Yunnan Province was taken for research by using numerical simulation.The static stability of stope structure after mining,and the dynamic and static stability under the coupling action of in-situ stress and blasting were investigated.The results showed that the pillar adjacent to the large compensation space had a high degree of stress concentration,and became the most dangerous area.The damage of surrounding rock in the stope was principally attributed to the coupling action of in-situ stress and blasting stress wave under high stress concentration,and the excavation by blasting in the large compensation space was the direct cause for the stope instability.For this reason,the size of compensation space should be reduced as much as possible and the compensation space should be evenly arranged in the room as much as possible in order to improve the stability of stope structure.