塑性混凝土防渗墙抗渗性能检测

Testing Study of Plastic Concrete Cutoff Wall Impermeability

利用墙体钻孔注水试验记录,基于塑性混凝土防渗墙渗透系数测试的钻孔常水头注水试验方法和围井注水试验法,采用孔口—孔底整段计算方式和每5 m一段的计算方式,计算得到某水利枢纽坝址地基塑性混凝土防渗墙的渗透系数,并对渗透系数数值分布区间进行了统计分析,结果表明:围井注水试验法得出的渗透系数比常水头注水试验法得出的渗透系数小1个数量级。钻孔所取得芯样的渗透系数室内试验结果表明:大多数芯样的渗透系数与围井注水试验法得出的渗透系数更接近,即围井渗透系数检测方法更符合工程的实际情况。

Using cutoff wall drilling-hole injection test records,based on methods of drilling-hole injection test with constant water level and wells injection test,two calculation methods of top to bottom of the whole hole and every 5 meters are respectively used.Cutoff wall permeability coefficients of a hydro dam foundation are got,and statistical analysis of the distribution range are conducted.The results of wells injection test are 1 order of magnitude smaller than ones of drilling-hole injection test with constant water level,and the results of wells injection test are closer to the core sample test results,and more consistent with the actual situation of the project than ones of drilling-hole injection test with constant water level.