为了研究西藏林芝特有土质边坡在降雨入渗条件下的稳定性,在饱和-非饱和土理论的基础上,利用有限元软件对边坡在发生降雨入渗后土体的孔隙水压力和变形两个方面进行研究.通过数值模拟结果可知,发生降雨后边坡的孔隙水压力与降雨前相比有所上升,并且随着降雨历时的增加,孔隙水压力的影响深度也在持续增加,但在15m以下的土体中,孔隙水压力随雨水入渗的变化相对较小,说明达到一定的深度后降雨对土体的抗剪强度影响较小;另一方面,雨水的入渗导致了边坡在水平和竖直两个方向的变形,变形的形式主要表现为坡顶的向下沉陷和坡脚处向外侧的移动,并且随着降雨时间的增长变形在不断地增加,导致边坡存在发生滑动变形的趋势.%Based on the theory of saturated-unsaturated soil,the finite element software is used to study the pore water pressure and slope deformation of the slope after rainfall infiltration,we study the stability of slope located in Linzhi of Tibet under the condition of rainfall.It is shown that the pore water pressure increases with the rainfall,and the influence depth of pore water pressure increases with increasing the rainfall.However,the pore water pressure of the soil is relatively small with the change of rainwater infiltration at the depth of 15m,which indicates that the effect of rainfall on soil shear strength is small after reaching a certain depth.The infiltration of rainwater leads to the deformation of the slope in both horizontal and vertical directions.The deformation is mainly manifested as the downward movement of the top of the slope and the outward movement of the slope,and we find the deformation will continue with the increase of rainfall time,which leads to the trend of sliding deformation.
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