中文摘要：

强降雨致堆（残坡）积碎石土渗透特性改变是触发滑坡、泥石流等降雨诱发型灾害的关键因素。为探究降雨入渗诱发滑坡的动态机制,通过自制一维渗透仪与二维边坡降雨入渗模型,对水竹湾隧道旁具有级配代表性的碎石土进行强降雨入渗试验,并通过Seep/w软件进一步分析堆积碎石土湿润锋迁移入渗规律。研究结果表明：一维入渗深度-时间曲线存在阶梯状趋势,即湿润锋迁移速度首先随表层土含水率的突增迅速增加至最大值,然后缓慢减小,最后湿润锋迁移速度略微增大;湿润锋平均迁移速率随雨强的增大趋近线性增长;碎石土沉降变形在入渗过程中经历缓慢增长、急剧增大、逐渐停滞3个阶段;坡顶、坡腰及坡脚处入渗速率与一维入渗速率分别满足指数关系、对数关系及线性关系;雨水最终入渗深度由大到小依次为坡脚、坡顶、坡腰。

英文摘要：

Heavy rainfall can change the permeability characteristics of aggregate gravel soil,which is the key factor triggering landslides,mudslides and other type of rainfall-induced disasters. This paper explores the dynamic mechanism of landslide induced by rainfall infiltration. Self-made one-dimensional permeameter and twodimensional slope model are used for the representative gradation gravel soil test close to Shuizuwan Tunnel. Then,further research focuses on the seepage regulation of aggregate through Seep / w software. The results show that：there is a step-ladder trend between wetting front and time curve. More specifically,wetting front migration rate can rapidly increase with the sudden increase of the topsoil moisture to a maximum. It can slowly decrease with increased pressure. Finally the wetting front migration rate can slightly increase with the decreased pressure. The average rate of wetting front migration approaches a linear growth with the increased rainfall intensity. Development of soil settlement deformation passes through three stages. They are slow growth,sharply rises and gradually stagnation. The one-dimensional infiltration rate has a power,logarithmic and linear relations with the slopeinfiltration rates at top,middle and toe of the slope,respectively. The final depth of rainwater infiltration is the toe of slope,the top of slope and mid-slop in order descending.