含裂隙非饱和土体的变形与渗流耦合的二维解析分析

TWO DIMENSIONAL ANALYTICAL MODEL OF COUPLED DEFORMATION AND SEEPAGE IN UNSATURATED SOILS WITH FISSURES

含裂隙土体在降雨条件下的渗流规律相对比较复杂,为进一步讨论含裂隙土体渗流机制,在一维解析解的基础上,建立二维饱和-非饱和含裂隙土渗流解析模型,并通过Fourier积分变化推导出二维渗流控制方程的显式解析解。此解析解考虑了多裂隙情况下的孔隙水压力分布和流量边界条件。二维解析解能够准确地获得渗流和变形耦合非饱和土中水的入渗影响规律,并进一步讨论了降雨条件下,不同裂隙模式(裂隙深度、裂隙发育位置及裂隙密集程度)对坡体渗流的影响规律,探讨了含裂隙区域的孔隙水压力分布规律。

The mechanism of seepage for fractured soil is definitely complex under rainfall conditions. In order to investigate the mechanism of seepage, a two-dimensional saturated-unsaturated fissure-soil seepage model is built and an explicit analytical solution to the two-dimensional seepage control equation is obtained by Fourier integration based on the current research work. Pore-water distributions and flux boundary conditions are considered for multiple fissures. The effect of water infiltration on coupled deformation and seepage in unsaturated soils could be obtained accurately by two dimensional Analytical model. We further discussed the influence rules of seepage for different fracture modes(depth, position and density) and the distribution of pore-water pressure under rainfall.