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Journal of Zhejiang University SCIENCE A 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.A2200416


Numerical Investigation of the Effect of GCL Chemical Incompatibility on Flow and Contaminant Transport through a Defective Composite Liner


Author(s):  Shiyuan YAO, Yuchao LI, Shan TONG, Guannian CHEN, Yunmin CHEN

Affiliation(s):  MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China; more

Corresponding email(s):   stong@zju.edu.cn

Key Words:  Geosynthetic clay liner, Chemical incompatibility, Leakage, Contaminant transport, Hydraulic conductivity


Shiyuan YAO, Yuchao LI, Shan TONG, Guannian CHEN, Yunmin CHEN. Numerical Investigation of the Effect of GCL Chemical Incompatibility on Flow and Contaminant Transport through a Defective Composite Liner[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .

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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A2200416"
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%T Numerical Investigation of the Effect of GCL Chemical Incompatibility on Flow and Contaminant Transport through a Defective Composite Liner
%A Shiyuan YAO
%A Yuchao LI
%A Shan TONG
%A Guannian CHEN
%A Yunmin CHEN
%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2200416

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T1 - Numerical Investigation of the Effect of GCL Chemical Incompatibility on Flow and Contaminant Transport through a Defective Composite Liner
A1 - Shiyuan YAO
A1 - Yuchao LI
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A1 - Guannian CHEN
A1 - Yunmin CHEN
J0 - Journal of Zhejiang University Science A
VL - -1
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A2200416


Abstract: 
A composite liner consisting of a geomembrane (GMB) and a geosynthetic clay liner (GCL) can be compromised by inorganic contaminants because of a defective GMB. When the composite liner with defective GMB is exposed to aggressive leachate conditions, the neglect of the chemical incompatibility of the GCL can potentially result in an underestimation of the leakage rate and flux through the composite liner. In this paper, a numerical investigation of the effect of chemical incompatibility of GCL on the barrier performance of the composite liner with hole-defective GMB was conducted via four cases with leachate solutions having varied cation valencies and ionic strengths, in which the hydraulic conductivity of GCL was concentration-dependent. Both the effect of the chemical incompatibility of GCL and the mechanisms causing the effect were analyzed. The incompatibility of GCL resulted in significant increases in leakage rate and flux through the composite liner by factors of up to 4.9 and 5.0, respectively. The incompatibility-affected area in GCL is located within 0.1 m from the center of the hole in the GMB. The coupled increase in the hydraulic conductivity of GCL and pore water concentration impacts the flux and leakage in a short period of time. With GCL chemical incompatibility considered, advection may dominate the contaminant transport through GCL.

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