深部开采高地应力区钻孔卸压数值模拟及应用

为防治三山岛金矿深部开采高应力作用下诱发的岩爆灾害,设计卸压钻孔方案减小水平地应力对围岩的影响。运用FLAC3D建立深部高应力巷道钻孔卸压的数值模型,分析了巷道钻孔卸压过程中采场周围岩体的应力和弹性应变能的变化。结果显示:钻孔卸压后,巷道水平和垂直方向最大应力有效转移,使巷道顶板和两帮应力均有显著下降,巷道围岩整体变形量减小,对缓解岩爆等地压灾害具有明显效果。现场布设的围岩应力监测系统显示,随着卸压钻孔的推进,围岩应力明显减小,证实钻孔卸压方案达到了卸压效果,提高了围岩稳定性。

Numerical Simulation and Application of Boreholes Destressing Technology in High In-situ Sress Zone During Deep Mining

In order to prevent the rock burst disaster caused by the high in-situ stress during the deep mining in Sans-handao Gold Mine,the destressing boreholes scheme is designed to decrease the influence of horizontal stress on surrounding rock. The numerical model of boreholes destressing in high in-situ stress zone is established based on FLAC3D software,to ana-lyze the variation characteristics of stress and elastic strain energy of the surrounding rock of the stope during the process of de-stressing. The results show that the vertical and horizontal maximum stress of the surrounding rock of the roadway are trans-ferred effectively after boreholes destressing,so,the stress of the roof and two sides of the roadway are lowered significantly,the whole deformation of surrounding rock is less,which indicated that the boreholes destressing is good to ease the rock burst dis-aster. The monitoring results of the surrounding rock stress monitoring system in the field show that with the development of de-stressing boreholes,the surrounding rock stress is lowered significantly,which further indicated that the destressing effects of the boreholes destressing scheme is good,and the stability of surrounding rock is improved effectively.