Hydraulic conductivity of desiccated geosynthetic clay liners

被引:3
作者
Boardman, T [1 ]
Daniel, DE [1 ]
机构
[1] UNIV TEXAS,AUSTIN,TX 78712
来源
JOURNAL OF GEOTECHNICAL ENGINEERING-ASCE | 1996年 / 122卷 / 03期
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D O I
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中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Large-scale tests were performed to determine the effect of a cycle of wetting and drying on the hydraulic conductivity of several geosynthetic clay Liners (GCLs). The GCLs were covered with 0.6 m of pea gravel and permeated with water. After steady seepage had developed, the water was drained away, and the GCL was desiccated by circulating heated air through the overlying gravel. The drying caused severe cracking in the bentonite component of the GCLs. The GCLs were again permeated with water. As the cracked bentonite hydrated and swelled, the hydraulic conductivity slowly decreased from an initially high value. The long-term, steady value of hydraulic conductivity after the wetting and drying cycle was found to be essentially the same as the value for the undesiccated GCL. It is concluded that GCLs possess the ability to self-heal after a cycle of wetting and drying, which is important for applications in which there may be alternate wetting and drying of a hydraulic barrier (e.g. within a landfill final cover).
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页码:204 / 208
页数:5
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