不同降雨条件下成都黏土基坑边坡入渗深度研究

降雨增湿导致成都黏土基坑边坡出现大范围的大变形或破坏，研究降雨过程中的入渗规律是分析边坡破坏机理及模式的关键。为了分析不同降雨条件下的入渗规律，确定入渗深度的大小，综合模型试验、现场试验和数值模拟结果，得到成都黏土基坑边坡降雨入渗规律及入渗深度的经验公式。结果表明:膨胀土模型试验的渗流相似条件难以完全满足，模型试验结果需要经过现场试验修正。降雨时长是入渗深度的主要影响因素，随着降雨时长、降雨强度的增大，入渗深度增大的速度逐渐减慢，采用分段线性拟合效果较好。成都黏土基坑边坡单次降雨的入渗深度小于1 m。

Infiltration depth of Chengdu clay foundation pit slope under different rainfall conditions

Rainfall humidification causes large deformation or damage to Chengdu clay pit slope. Methods of model test, field test and numerical simulation are used to analysis infiltration depth under different rainfall conditions. Infiltration law and infiltration depth empirical formula are obtained by comparing the results of the analysis. The results show that model test is difficult to simulate really due to Chengdu clay swelling, soil structure and microcracks having a big influence on seepage. The results need a correction through field test. The main factor which influences the rainfall duration is the depth of infiltration. With the increase of rainfall time and rainfall intensity,the increasing speed of infiltration depth gradually slows down. It is good to use piecewise linear fitting. The infiltration depth of single rainfall in Chengdu clay slope is less than 1 m.