The Long-Term Test of the Solute Transport Throughout the Geosynthetic Clay Liners

 

Liu Lei

State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences, Wuhan, Hubei, 430071, P.R.China
e-mail: lliu@whrsm.ac.cn

Xue Qiang

State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences, Wuhan, Hubei, 430071, P.R.China
e-mail:qiangx@whrsm.ac.cn

Zhao Ying

State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences, Wuhan, Hubei, 430071, P.R.China
e-mail: yzhao@whrsm.ac.cn

Zhang Qian

State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences, Wuhan, Hubei, 430071, P.R.China
e-mail: qzhang@whrsm.ac.cn

ABSTRACT

The hydraulic conductivity of geosynthetic clay liners (GCLs) is significantly influenced in the permeation process with inorganic solution. The effect is related to the ion substitution. The change of the hydraulic conductivity of the GCLs is dependent upon the pre-treatment of the specimen before the solute permeation. In this study the penetration test for GCLs using the flexible-wall system was conducted. The test results show that the disturbance of the hydraulic conductivity of the GCLs at the pre-saturation condition by the deionized water is smaller than using the solution, due to the separation of the Na+ from the bentonite is attenuated. The pore volumes of flow decreased with the solute concentration increasing, which contributed to the change of the hydraulic conductivity.

Keywords: Solute transport, GCLs, permeation, hydraulic conductivity

Get the entire paper (pdf)    Go back to the TOC