中文摘要：

土体降雨入渗特性是实施坡面泥石流和土体滑坡发育过程研究的重要因素。研制了人工降雨土柱入渗试验装置，实施了10、20、30、40、50、60 mm/h共6种降雨强度下强风化泥岩的入渗试验，最长降雨历时105 min。试验结果表明：可将土体入渗过程可分为无压入渗、有压入渗和饱和入渗3阶段，其中土体的入渗率在无压入渗阶段和饱和入渗阶段均随降雨历时增长近似为常数，在有压入渗阶段则快速降低；通过定义降雨作用下土体入渗锋，包括初始入渗锋和终止入渗锋，分析了入渗锋所处位置随降雨强度的变化关系，初始入渗锋和终止入渗锋之间的幅值随降雨强度的增大而变宽；提出了可表征重庆地区侏罗系强风化泥岩入渗过程的土体降雨入渗公式。研究成果对于构建重庆地区降雨诱发型滑坡及坡面泥石流的预测预报模型有积极意义。

英文摘要：

The infiltration characteristics of soil under the action of heavy rainfall is an important part to study the developing process of landslide debris flow and soil landslide. A soil cylinder experimental facility for infiltration test under artificial rainfall is prepared to do infiltration test for strongly weathered mudstone under six rainfall intensities, i.e. 10, 20, 30, 40, 50 and 60 mm/h, and the longest rainfall duration is 105 minutes. Three conclusions are drawn as follow. Firstly, the infiltration process can be divided into non-compressive infiltration, compressive infiltration, and saturated infiltration stages. Meanwhile, the infiltration rate will close to be a constant along the rainfall duration in the non-compressive infiltration and saturated infiltration stages, and it will reduce quickly in compressive infiltration stage. Secondly, the infiltration interface in the soil is defined as infiltration front, and it contains original infiltration interface and final infiltration interface. Then, the relation is discussed between the depth of infiltration front and rainfall intensity, the bigger the rainfall intensity is, the bigger the amplitude between two infiltration interfaces is. Thirdly, a rainfall infiltration formula is built to express the infiltration process of Jurassic strong weathering mudstone in Chongqing city. The results have positive effect for the study of constructing the forecasting model of rainfall-induced type landslide and slope debris flow in Chongqing city.