降雨情况下排土场边坡稳定性数值模拟研究

Numerical Simulation on Dump Slope Stability under Rainfall Infiltration

排土场边坡不同于一般边坡,排土体为松散介质,降雨入渗对排土场边坡稳定性影响较大。为了定量研究降雨对排土场边坡的稳定性影响,以及防水和排水措施对边坡稳定性的影响,首先建立降雨情况下排土场渗流数值模型,分析排土场内部渗流场;然后对排土场边坡进行水土耦合分析,通过水土耦合分析发现降雨情况下边坡稳定性安全系数大大降低。为了服务于工程和科学研究,进一步对防渗和排水情况下排土场边坡稳定性进行定量研究。研究发现:在排土场台阶底部设置排水管道或者在排土场顶部设置防水层可以大大提高降雨情况下边坡稳定性。研究结果可为正确评价和治理该类边坡的稳定性提供科学依据。

Unlike ordinary slop% dump slope is made of loose media and its stability is greatly affected by rainfall infiltration. In order to quantitatively study the impact of rainfall as well as waterproofing and drainage measures on the stability of dump slope, firstly, we built a numerical model of dump slope seepage under rainfall infiltration to analyze the internal seepage field; and then through soil and water coupling analysis we found that the safety factor of dump slope decreased remarkably in rainfall condition. In order to serve the engineering and scientific research, we further studied the stability of dump slope under seepage-proofing or drainage conditions. Results suggest that drainage pipes in the bottom of the slope terrace or seepage-proofing layer on top of the slope could greatly improve the slope stability under rainfall infiltration. The research result provides basis for the design and regulation of dump slope.