贯穿断层及隐伏巷道对某露天边坡稳定性影响数值模拟分析

为研究贯穿断层(F₁)及历史采空巷道对广东某露天矿边坡稳定性的影响，基于现场工程调查得到不同岩组的岩体质量评价指标，采用Hoek-Brown强度准则及工程类比法得到岩体参数，结合实际工况建立含贯穿断层及历史采空巷道的三维地质模型进行综合边坡稳定性分析。结果显示：在154 m及197 m水平位置的历史采空巷道，边坡顶部及坡面位移较小，拉应力小于岩体抗拉强度，同时塑性区未能进行上下贯通；矿区贯穿断层(F₁)在坡面的拉应力值小于全风化岩体的抗拉强度，最大位移仅在坡顶及底部，竖向位移量为1.4 mm,在贯穿断层附近塑性区无贯穿情况发生。结合以上分析，贯穿断层及历史采空巷道对自然状态下的边坡稳定性影响不大，该结论为矿山安全生产奠定了基础。

Numerical simulation analysis of influence of penetrating fault and underground concealed roadway on stability of an open-pit slope

In order to study the effect of through-fault (F1) and historical mined-out roadway on the slope stability of an open-pit mine in Guangdong. In this paper, rock mass quality evaluation indexes of different rock groups were obtained based on field engineering investigation, rock mass parameters were obtained by the Hoek-Brown strength criterion and engineering analogy method, and a three-dimensional geological model of roadway containing penetrating faults and the historical mined-out roadway was established combining with actual working conditions for comprehensive slope stability analysis. The results show that on 154 m and 197 m levels, the displacement at the top and surface of the slope is small, the tensile stress is less than the tensile strength of the rock mass, and the plastic zone fails to connect from top to bottom. The tensile stress value of the through-fault (F1) in the mining area on the slope is smaller than that of the tensile strength of the fully weathered rock mass. The maximum displacement is only at the top and bottom of the slope, and the vertical displacement is 1.4 mm. No through-fault occurs in the plastic zone near the through-fault. Combined with the above analysis, the through-fault and the historically mined-out roadway have little influence on the stability of the slope in the natural state, which lays a foundation for the safe production of the mine.