Numerical simulation of the unsaturated seepage field in the Dayantang landslide under the condition of fog rain
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摘要: 泄洪雾雨对滑坡渗流场的影响涉及到雾雨强度的确定、雾雨产生坡面径流及坡体饱和-非饱和渗流分析等一系列复杂问题。文章利用模糊综合评判方法确定了水布垭大岩淌滑坡的雾雨强度;通过试验确定了滑坡土体的土水特征曲线;利用坡面径流-非饱和渗流耦合数值模拟方法计算了在雾雨作用下滑坡体内渗流场变化规律。研究结果为雾雨作用下大岩淌滑坡的稳定性预测提供了渗流场条件,研究方法为雾雨或降雨作用下滑坡的非饱和渗流场数值模拟提供了一条新途径。Abstract: The fog rain has an effect on the seepage field of landslides.The effect involves a series of complex problems,such as intensity decision of the fog rain,surface flow and saturated-unsaturated seepage analysis of the landslides,etc.The fog rain’s intensity of the Dayantang landslide,which is located at the Shuibuya project,is obtained with the fuzzy comprehensive evaluation method.The soil-water characteristic curve is determined with tests,and the variable regulations of the seepage field in the landslide is gained with sloping surface run off-unsaturated seepage coupled numerical method.The results provide a seepage field condition used to forecast the stability of the Dayangtang landslide.The research methods offer a new way for simulating unsaturated seepage field of the landslide under the condition of fog rain or rainfall.
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