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研究降雨自由入渗阶段土体内的水势变化规律具有重要的工程意义。讨论了现有的入渗模型及降雨非饱和渗流计算方法。认为其不能满足工程渗透稳定性分析的需要,且不符合实际的降雨物理过程。设计了室内降雨自由入渗负压测试试验,结果显示:土体负压在入渗阶段的变化规律符合Boltzmann函数曲线,降雨强度越大负压值变化越快。结合土壤水能态理论,分析了自由入渗阶段土体内水势的变化和分布规律,并指出非饱和渗透系数随着降雨强度的增大而增大。该研究为低降雨强度条件下岩土工程的渗透稳定性问题的分析提供了参考依据。
It has important engineering significance to study the variation of water potential in the soil during free-infiltration rainfall. The existing infiltration model and the calculation method of rainfall unsaturated seepage are discussed. Think it can not meet the needs of project penetration stability analysis, and does not accord with the actual rainfall physical process. The test of negative infiltration of rainfall is designed. The results show that the variation law of negative pressure of soil under infiltration phase conforms to the Boltzmann function curve. The greater the rainfall intensity, the faster the negative pressure changes. Based on the theory of soil water energy state, the variation and distribution of water potential in free-infiltration soil are analyzed. It is also pointed out that the unsaturated permeability coefficient increases with the increase of rainfall intensity. This study provides a reference for the analysis of seepage stability of geotechnical engineering under low rainfall intensity.