堤坝渗漏广义示踪法室内试验研究

摘要

Absract: With laboratory testing rig and testing program designed, the fine sand, medium sand and coarse sand are chosen as test material respectively, and the salt solution is chosen as tracer agent, then the seepage velocity is calculated through the relationship between the conductivity of tracer agent in different test material and time. The value of seepage velocity calculated through traditional dilution formula in all sand layers is a little larger than that by testing discharge method. The specific value of them is constant in the same hydraulic gradient, while it is imparity in different sand layers. The dilute tracer correction coefficient is proposed as well as the modified dilution formula, meanwhile the experimental value of dilute tracer correction coefficient is given.%以堤坝填筑材料中常见细砂、中砂、粗砂为试验材料,以食盐溶液为示踪剂,通过测试各材料中示踪剂电导率随时间的变化规律,计算其渗透水平流速.经试验传统点稀释公式计算得出的渗透水平流速在各砂层中对比流量法测试得到的流速偏大,在同一砂样不同水力梯度下两流速比值基本为一恒定值,而在不同砂层中比值不尽相同.对原点稀释计算公式进行了修正,并给出了修正系数实验值.