渗流条件下山体土质边坡的蠕变分析

Analysis on Creep Deformation of Soil Slope under the Action of Seepage

运用改进西原蠕变模型,建立了能反映蠕变全过程的非线性粘弹塑性蠕变模型,结合渗流力学理论得出了平面应变情况下的流固耦合方程。通过算例数值计算对降雨条件下土质坡体特征点的水平和垂直位移进行了分析,结果与现场调查相符。计算结果表明,土质边坡在降雨入渗初期位移变化较大,且水平位移比垂直位移大;降雨入渗具有迟滞效应,雨水渗流主要集中在坡体浅层,加强坡面防护很关键。

Based on modified Xiyuan model, the non-linear visco-elastic plastic creep model which can show the whole creep process is built, and the fluid-structure interaction equations on the case of plane strain is also gained after combined with the flow mechanics theory. The numerical calculation is performed to analyze the horizontal and vertical displacements of the key points in soil slope under rainfall conditions. The results correspond with the on-site investigation. The resuhs show that, （a） the displacement of soil slope is larger in the early stage of rain infiltration, the horizontal displacement is larger than the vertical displacement, and the slope slipping is lag to rain infiltration; （b） the rain infiltration mainly occurs in the shallow scope of slope, so the slope surface reinforcement is important.