金属矿山矿柱回采时爆破荷载下采空区的围岩稳定性

Surrounding rock stability of mined-out area under blast loading in metal mine pillar robbing

以朝不楞矿区铁锌多金属矿山工程地质为依据,采用FLAC-3D软件及超声波测试,以岩体爆破损伤理论为基础,系统研究了多次爆破作用下井下分段回采巷道掘进时,回采巷道围岩损伤累计增长规律,并对尾砂胶结物充填相邻采空区下的矿柱回采进行了三维有限元数值模拟,分析了围岩爆破累计损伤和残留矿体矿柱回采及采空区稳定性。

By taking the engineering geology of the Fe-Zn polymetallic ore in Chaobuleng mine as an example, based on the blast damage theory of rock, the FLAC-3D software was adopted and ultrason- ic tests were carried out to systematically explore the cumulative damage development in the surround- ing rock of the re-exploited tunnel. In the above investigation, the surrounding rock was impacted by blasting for many times in the section excavation process. And the re-exploitation of the tiberium spike under the mined-out area adjacent to the re-exploited tunnel was numerically simulated. Thereby the stability of the surrounding rock of the mined-out area was analyzed. It is helpful for engineering application.