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降雨是导致边坡失稳的最主要的环境因素,研究降雨入渗对边坡稳定性的影响,关键和难点是计算降雨入渗在边坡土体中引起的渗流场。采用Fourier积分变换分别对降雨强度小于和大于土体饱和渗透系数情况下的斜坡入渗解析解进行了推导,并给出了这两种情况下斜坡入渗解析解的统一表达式。该解不仅能反映非饱和土特性及斜坡的影响,还能反映当降雨强度大于土体饱和渗透系数时,坡面边界由流量边界转化为水头边界的动态变化过程,便于更全面地对降雨情况下斜坡的入渗规律进行研究。通过与有限元软件的计算结果进行对比,证明该解是稳定可靠的,且其形式简单,计算效率高;该解可精确计算坡面积水时间及任意时间点及空间点的孔隙水压力值,并用于评估降雨入渗对非饱和土斜坡稳定性的影响。
Rainfall is the most important environmental factor that causes slope instability. The key and difficult point to study the influence of rainfall infiltration on slope stability is to calculate the seepage field caused by rainfall infiltration in slope soil. Using Fourier integral transform, the analytic solutions of slope infiltration under rainfall intensities less than or greater than soil saturated permeability coefficient are respectively deduced, and the unified expressions of analytic solution of slope infiltration in these two cases are given. The solution can not only reflect the characteristics of unsaturated soil and the impact of slope, but also reflect the dynamic change of slope boundary from flow boundary to head boundary when the rainfall intensity is greater than saturation permeability coefficient of soil so as to more completely analyze the rainfall situation Under the slope infiltration law to study. By comparing with the results of finite element software, it is proved that the solution is stable and reliable, and its form is simple and the computational efficiency is high. The solution can accurately calculate the slope water time and the pore water pressure at any time point and space point , And used to assess the impact of rainfall infiltration on the slope stability of unsaturated soils.