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以金川露天石英石矿采场岩质多级边坡为研究背景,运用岩石破裂过程分析软件RFPA对多级边坡的在开挖卸荷条件下的变形失稳过程进行数值模拟,对含软弱结构面的边坡进行分层处理并与完整结构面的边坡变形失稳特征进行对比分析。研究结果表明:边坡的软弱夹层附近更易产生局部应力集中并且最早出现初始裂纹;含有软弱层的应力场在边坡变形失稳破坏前后均存在较大应力波动,与完整结构面的边坡相比应力场的剪应力的峰值提升了1.1MPa。在强度折减过程中滑动贯通面形成的时间提前了五步,边坡强度安全储备系数下降了0.47;研究结果对于边坡的整体稳定性评价具有一定的参考价值。
Taking the multi-grade rock slope in Jinchuan open-pit quartzite stope as research background, the rock failure process analysis software RFPA was used to simulate the deformation and instability of multi-slope under excavation and unloading, The slope of the structure surface is stratified and compared with the slope instability characteristics of the complete structure surface. The results show that the local stress concentration is more likely to occur in the vicinity of the weak interlayer of the slope and the earliest initial crack occurs. The stress field containing the weak layer has large stress fluctuation before and after the deformation and failure of the slope, The peak value of specific stress field shear stress is increased by 1.1MPa. The time taken for the sliding through surface to form during the strength reduction process is advanced by five steps, and the safety and stockpile coefficient of slope strength is decreased by 0.47. The research results have certain reference value for the overall stability evaluation of the slope.