大渡河中游某古冰水堆积体降雨入渗特征试验研究

Experimental Study on Rainfall Infiltration Characteristics of an Ancient Ice Water Accumulation Body in Dadu River

以大渡河中游某古冰水堆积体为例,通过原位渗透试验实际测得该土体渗透系数,并进行现场降雨试验,针对堆积体内部体积含水率、孔隙水压力和基质吸力的变化,对其入渗特征规律展开了较为深入地分析。实测数据结果表明:该地冰水堆积体实际入渗系数K=2.39×10^(-3) cm/s;降雨在该堆积体中的入渗影响深度不足4 m且雨水下渗存在明显的滞后效应;小雨、中雨、大雨的影响深度分别为0.6 m、1.4 m、2.9 m。研究成果可为该地区工程边坡施工治理提供参考和借鉴。

Taking an ancient ice water deposit body in the middle of Dadu river as an example,the hydraulic conductivity of the soil was measured through in-situ infiltration test and rainfall test.The infiltration characteristics and laws were deeply analyzed in view of the changes of volume moisture content,pore water pressure and matric suction in the accumulation body.The measured data show that:the hydraulic conductivity of the region is roughly about K=2.39×10-3 cm/s;the infiltration depth of rainfall in the accumulation is less than 4 m and it exist a significant hysteresis effect during the rainfall infiltration;the influence depths of light rain,moderate rain and heavy rain are 0.6 m,1.4 m and 2.9 m respectively.The research results can provide reference for the construction and treatment of engineering slope in this area.