流形方法在露天转地下开采矿山边坡稳定性分析中的应用

Application of Numerical Manifold Method in Slope Stability Analysis of Transition from Open-pit to Underground Mining

根据云南晋宁磷矿6号坑的勘察资料,建立了露天转地下开采磷矿边坡2维数值流形计算模型,计算得到磷矿边坡应力场,并通过图论搜索算法计算得到地下开采过程各施工步边坡的安全系数和滑裂面。分析计算结果表明,地下开采对两侧边坡的安全系数以及滑裂面均有显著影响,边坡安全系数随着回采进行整体呈下降趋势,边坡滑裂面不断向采空区方向靠近,计算结果说明了流形方法在矿山边坡稳定性分析中的适用性。

According to the exploration data of No.6 pit in Jinning phosphate mine of Yunnan, the 2D numerical manifold model of underground mining slope was built, and the slope stress field was obtained. The graph theory search algorithm was used to obtain the slip surface and the safety factors of each step during the underground mining. According to the result, underground mining had significant effect on the safety factor of slope in both sides and the slip surface of the slope, the safety factor of slope decreased with the mining progress, and the slip surface of slope moved towards the goaf. The result showed that the nu- merieal manifold method had good applicability in slope stability analysis.