摘要
渗透系数是土石坝防渗心墙料填筑质量评价的重要指标之一。针对云南省内多个土石坝工程,对施工碾压后的防渗心墙料,采用现场双环、单环法和室内变水头法进行了渗透试验,并采用规范推荐的渗透系数近似值与较精确值方法计算了两种原位测试方法的心墙料渗透系数,并与变水头方法计算的渗透系数进行了对比分析。结果表明,采用近似值计算渗透系数偏差较大,建议在实际工程质量检测中采用精确值计算法;单环法和双环法的试验结果较为接近,可以利用单环法代替双环法进行防渗心墙料的现场渗透测试,这种替代能够加速现场渗透系数的检测效率,提高施工速度。最后研究了不同饱和时间对渗透系数测定的影响。
Permeability coefficient is one of the important indexes for evaluating the filling quality of impervious core material in earth- rock dams. For several earth dams in Yunnan Province,the in- situ double- ring,single- ring and indoor varying-head permeability tests were carried out. The approximate value method recommended by the standards and the accuracy value method are used to calculate the permeability coefficient of the two in- situ tests,and the results are compared with that of the varying- head permeability method. The results show that the deviation of approximate value method is larger,therefore the accuracy calculation value is recommended. The test result determined by double- ring is close to that by single- ring method,so the single- ring method could replace the double- ring method in in- situ test,which can improve the detection efficiency. Furthermore,the effect of saturation time on permeability coefficient test in field is studied.
出处
《人民长江》
北大核心
2015年第8期87-91,共5页
Yangtze River
基金
云南省水利科技项目(2011-01)
关键词
土石坝
防渗心墙料
现场渗透试验
渗透系数
饱和时间
earth-rock dam
impervious core material
in-situ permeability test
permeability coefficient
saturation time
