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降雨入渗是非饱和土中水分迁移的重要因素。通过VG模型、渗流理论和弹性力学理论,推导出二维非饱土水—力耦合控制方程,利用COMSOL Multiphysics有限元软件对非饱和土渗流变形耦合控制方程组进行计算,研究了不同模型尺寸下土体中压力水头随时间的演化及变化规律,采用数值方法探索半无限非饱和土降雨入渗问题。结果表明,半无限渗流问题在一定条件下可作为有限尺寸的渗流问题;降雨入渗过程中水头水平向变化比竖向大;压力水头在非耦合情况下比耦合情况下入渗更快,但两者的压力水头分布无明显差异;降雨初期顶点位移就发生明显的变化。
Rainfall infiltration is an important factor in water migration in unsaturated soils. Based on the VG model, seepage theory and elastic mechanics theory, the coupled two-dimensional non-saturated water-power control equations are deduced. COMSOL Multiphysics finite element software is used to calculate the coupled equations of seepage deformation of unsaturated soils. The effects of different model sizes The evolution and variation of pressure head in soil with time, the numerical method is used to explore the rainfall infiltration problem in semi-infinite unsaturated soil. The results show that the semi-infinite seepage flow problem can be regarded as a finite-size seepage problem under certain conditions. The horizontal change of water head in rainfall infiltration process is larger than that in vertical direction. The pressure head does not infiltrate faster than the coupling case under non-coupling condition There was no significant difference between the pressure head distribution of the two; the displacement of the apex in the early stage of rainfall changed obviously.