考虑降雨因素的废石堆场边坡稳定性研究

针对凡口铅锌矿废石堆场在降雨作用下可能失稳滑坡的问题,采用FLAC^3D数值模拟方法对比分析了考虑50年一遇降雨条件和不考虑降雨条件下废石堆场边坡的稳定性,并模拟了削坡处理对边坡稳定性的影响。结果表明,降雨会明显增加废石堆场边坡失稳风险,不考虑降雨条件下最大安全边坡角度为43°,考虑降雨条件下最大安全边坡角度为37°,削坡处理后边坡安全系数在降雨条件下达到1.43,表明削坡处理后边坡稳定性良好。

Slope Stability Analysis for Waste Rock Dump Based on Consideration of Rainfall

In view of potential instability and landslide of waste rock dump in Fankou Lead-Zinc Mine due to the effect of rainfall, the slope stability of waste rock dump was analyzed using FLAC^3D numerical simulation based on the considerations of a 1-in-50-year rainfall event and no rainfall condition, as well as after the slope cutting treatment. The results show that rainfall will significantly increase the potential slope instability of waste rock dump. The maximum safe slope angles should be 37° and 43° respectively in consideration of rainfall or no rainfall conditions. After slope cutting, the factor of safety of the slope under rainfall conditions is 1.43, indicating the slope with high stability.