露天矿边坡与地下采空区相互作用的数值分析

Numerical analysis of the interaction between open-pit slope and underground stope

利用SURPAC建立露天矿边坡和地下采空区相互关系的三维数值模型,然后,通过自编的SURPAC-FLAC3D转换接口,将所建立的三维模型导入FLAC3D进行计算,对比了边坡岩体中存在空区和无空区情况下,岩体的应力和变形特征,得到:(1)有采空区情况下,空区周围出现明显应力集中现象,应力形式主要为压应力;采空区的存在阻隔了应力的传递;(2)采空区使边坡开挖后的水平位移明显增大,而边坡的开挖也使采空区周围的应力场发生了相应的变化,空区周围出现破坏区;(3)采空区对边坡塑性区分布造成一定影响,降低了边坡的稳定性.

Three-dimensional numeric al model is built by SURPAC for the open-pit slope and underground stope, then the model is introduced to FLAC^3D for calculation by the self-compile SURPAC-FLAC^3D interface program. The stress and deformation characteristic of rock mass is analyzed for the situations with and without stope in the slope rock mass. The analysis results show that, （1） for the situation with stope in the slope rock mass, the stress is coneentrated around the hole, which shows in the compressive way; and the hole prevents the transfer of stress; （2） stope makes the horizontal displacement become larger after the slope excavation, and the slope in turn makes the change to the stress around stope, and leads to the failure of some parts rock mass; （3）stope has some influence on the plastic zone distribution of slope rock mass, and reduce the stability of slope.