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以某露天矿边坡为研究对象,结合矿区的水文工程地质条件,借助有限元计算软件Midas/GTS,在两种不同的降雨条件开展了多个工况下的露天矿边坡稳定性研究分析。结果表明:在强降雨条件下,由于降雨强度远大于土体的渗透能力,短时间内边坡浅层土体含水量会迅速增加,会形成暂态饱和区,因此对深部土体影响较小,对边坡的稳定性和安全系数影响较小;连阴雨条件下,当降雨强度小于土体的渗透能力时,雨水能够充分渗入到边坡土体中,对边坡稳定性产生不利影响。通过绘制曲线图可知渗透系数的增大开始阶段安全系数按斜率较大的线性函数发生变化,随后安全系数递减速率逐渐降低,当饱和透系数达到一定程度后,安全系数变化不明显。
Taking the slope of an open pit mine as the research object, combined with the hydrogeological and geological conditions in the mining area, the stability analysis of the open pit mine under several conditions was carried out by means of finite element calculation software Midas / GTS under two different rainfall conditions . The results show that under heavy rainfall conditions, the water content of shallow soil in the slope will increase rapidly in a short period of time due to the rainfall intensity being far greater than that of the soil. The transient saturated zone will be formed, so the influence on the deep soil is small , Which has little effect on slope stability and safety factor. Under rainy conditions, when rainfall intensity is less than soil permeability, rainwater can fully infiltrate into the slope soil, adversely affecting slope stability. By plotting the graph, the safety coefficient changes with the linear function with larger slope in the initial stage of the increase of permeability coefficient, then the decreasing rate of safety coefficient decreases gradually. When the saturated permeability coefficient reaches a certain level, the safety factor does not change obviously.