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该文研究FDEM降雨模型下非饱和土路基渗流及路基含水量的变化。基于路基内部水运动原理分析了降雨对路基的浸润作用;探讨FDEM降雨模型雨水入渗路基机理,推导出降雨作用下雨水入渗路基深度公式;研究了降雨作用下非饱和土路基的饱和-非饱和流。基于一般渗流方程的基础上,初步推出了降雨作用下非饱和土路基的饱和-非饱和渗流公式。分析结果表明,降雨作用下的路基渗流的深度可达100cm以上,含水量的变化可达15%。
This paper studies the seepage of unsaturated soil subgrade and the change of subgrade moisture content under FDEM rainfall model. The infiltration effect of rainfall on subgrade was analyzed based on the principle of water movement inside the embankment. The subgrade mechanism of rainwater infiltration in FDEM rainfall model was discussed. The formula of subgrade depth of rainfall infiltration under rainfall was deduced. The saturation of non-saturated soil subgrade under rainfall Saturated flow. Based on the general seepage equation, the saturated-unsaturated seepage formula of unsaturated soil subgrade under rainfall is preliminarily introduced. The results show that the subgrade seepage depth under rainfall can reach more than 100cm, and the change of water content can reach 15%.