Laboratory hydraulic conductivity testing of GCLs in flexible-wall permeameters

被引:29
作者
Daniel, DE
Bowders, JJ
Gilbert, RB
机构
来源
TESTING AND ACCEPTANCE CRITERIA FOR GEOSYNTHETIC CLAY LINERS | 1997年 / 1308卷
关键词
hydraulic conductivity; permeability; bentonite; geosynthetic clay liner; GCL; flexible-wall permeameter; precision; bias; variability;
D O I
10.1520/STP11804S
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
One of the important properties of geosynthetic clay liners (GCLs) is hydraulic conductivity. In the laboratory, hydraulic conductivity of GCLs is typically measured in flexible-wall permeameters. The most important variables in hydraulic conductivity testing of GCLs are addressed, including (i) trimming the GCL specimen; (ii) determining the thickness of the specimen; (iii) selecting the effective stress; (iv) selecting the hydraulic gradient; and (v) selecting the first wetting liquid and permeant liquid. A round-robin testing program was conducted in which 18 laboratories independently measured the hydraulic conductivity of a GCL that was permeated with water. The test specimens all came from the same GCL sample. The coefficient of variation, accounting for all sources of variability, was 42%. For experienced laboratories, this value reduced to 35%, which was identical to the variation in quality control tests performed over a 7-month period by the manufacturer on a variety of GCL samples. The round-robin test results are encouraging; there was less variability than might be expected, considering the difficulty in accurately measuring the hydraulic conductivity of relatively impermeable materials such as GCLs.
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页码:208 / 226
页数:19
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