Abstract:

Unlike ordinary slope, 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.

Key words: dump slope, numerical simulation, seepage field, rainfall intensity, slope stability