论文部分内容阅读
降雨是非饱和土边坡失稳的关键因素之一,非饱和土体的强度与体积含水率有密切的关系.考虑二维降雨入渗条件,基于非饱和土达西渗流定理及质量守恒定律建立了非饱和土的二维降雨入渗模型方程.基于交替隐式有限差分法,采用MATLAB编制了计算程序,对方程进行了数值计算,研究了不同降雨条件、边坡内部不同位置的瞬态体积含水率分布.研究表明,由于考虑了水平方向的入渗,边坡内随着深度和水平距离的增加,体积含水率都发生了变化,在距离边坡表面1 m左右时,体积含水率变化率变小,边坡表层的体积含水率变化远远大于边坡深部.初始体积含水率越小,边坡体积含水率变化越大,这对边坡的稳定性不利.
Rainfall is one of the key factors in the instability of unsaturated soils, and the strength of unsaturated soils is closely related to the volumetric water content. Considering two-dimensional rainfall infiltration conditions, based on Darcy seepage theorem of unsaturated soil and the law of mass conservation, Based on the alternating implicit finite difference method, the calculation program was programmed by MATLAB and the equations were calculated numerically. The effects of different rainfall conditions, transient volume at different positions inside the slope The results show that the volumetric water content changes with the increase of depth and horizontal distance within the slope due to the horizontal infiltration. When the water content is about 1 m away from the slope surface, When the initial volumetric water content is smaller, the change of the volumetric water content of the slope is larger, which is unfavorable to the stability of the slope.