高阶段崩落法采场地压规律数值模拟分析

采用三维弹塑性有限元法对高阶段崩落法采矿的凿岩进路开挖、切割槽开挖和崩落回采过程进行了数值模拟研究。结果表明, 凿岩进路开挖后, 由上往下巷道周边的应力和位移量呈递增趋势, 巷道顶板拉应力区的深度为0.8~1.5 m;切割槽开挖后, 凿岩进路周边应力和位移量都有所增加, 影响范围约为15 m;随着崩矿的进行, 凿岩进路周边的应力和位移量缓慢增大, 采场应力环境不断恶化。

Numerical Simulation Analysis for Ground Pressure Law of High-Stage Caving Mining Method

Numerical simulation analysis was performed for drift excavation by drilling, trench excavation and caving processes during the high-stage caving mining by using three-dimensional elastoplastic finite element analysis. Results show that after drift excavation, the stress and displacement around the drift tend to increase progressively from top to bottom, and tensile stress zone of the drift roof is 0.8~1.5 m in depth. After trench excavation, the stress and displacement around the drift are increased to some extent, which will bring influence to an area within the range of 15 m. With the progress in the caving mining, the stress and displacement around the drilled drift increase slowly, leading to the stress environment of the stope continuously deteriorated.