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在露天矿开采过程中,高陡边坡的稳定性日益成为威胁其安全生产的一大难题。以辽宁南芬露天铁矿为工程背景,结合其下帮高陡边坡工程地质与水文地质条件,发现雨季降雨是高陡边坡滑坡的重要原因,利用边坡滑动监测系统与降雨量实时监测系统得到滑坡与同时期降雨量监测数据,进行降雨与边坡局部失稳滑坡的相关性分析,发现降雨量大于100 mm的大暴雨与滑坡具有很好的相关性,暴雨及以上强度的降雨是诱发下帮边坡滑坡的重要因素。利用SEEP/W有限元软件模拟大暴雨入渗条件下边坡岩体渗流场变化全过程,计算不同渗流时刻的边坡稳定性系数与边坡应力应变情况,验证统计分析的可靠性并揭示降雨对边坡稳定性影响的机制,同时发现在大暴雨过后,滑坡一般具有24 h左右的滞后性,并提出南芬露天矿山岩质高陡边坡水文灾害治理的有效措施。研究成果可为类似高陡边坡工程提供有意义的参考。
In the open pit mining process, the stability of high steep slopes is increasingly becoming a major threat to its safety in production. Based on the Nanfen open-pit iron mine in Liaoning Province, combining with the engineering geological and hydrogeological conditions of the high-steep slope, it is found that rainfall in the rainy season is an important reason for the landslides on the steep slopes. By using the slope monitoring system and real-time rainfall monitoring The system obtains the data of landslide and rainfall monitoring in the same period, and analyzes the correlation between rainfall and partial landslide. It is found that there is a good correlation between the heavy rainfall with rainfall greater than 100 mm and the landslide. Rainstorms and above rainfall are induced Downhill slope landslide important factor. SEEP / W finite element software was used to simulate the whole process of seepage field under the condition of heavy rain infiltration. The slope stability coefficient and slope stress-strain of different seepage time were calculated to verify the reliability of statistical analysis and to reveal the relationship between the rainfall on the edge Slope stability. At the same time, it is found that the landslide generally has a hysteresis of about 24 h after the heavy rainstorm, and the effective measures for harnessing hydrological hazards of the rocky high steep slope in the Nanfen open-pit mine are proposed. The research results can provide a meaningful reference for similar high-steep slope engineering.