软弱岩层巷道围岩控制的数值模拟分析研究

Study on numerical simulation of the weak surrounding rock control in the laneway

大倾角"三软"破碎带内巷道围岩失稳问题是矿山开采所面临的主要问题之一。以青海某金矿的软弱围岩巷道为背景进行有限元模拟,发现大倾角破碎带巷道开挖后应力重新分布,且应力变化范围较大,其中拱腰和低边墙出现应力集中,发生拉应力破坏。通过对应力集中区进行锚杆支护,有效地控制了围岩变形。

The surrounding rock instability of large angle laneway with three-solt crushed zone is one ot the ma- jor problems. The weak surrounding laneway of one gold mine in Qinghai is simulated and analyzed with FEM. It is shown that the stress distribution is altered largely and the change range is wide. The stress concentration takes place in lateral wall and crown and it belongs to pulling stress destroying. The zone with stress concentration is sup- ported with anchor bolt to control the deformation of surrounding rock effectively.