TY - JOUR
T1 - Hydraulic performance of geosynthetic clay liners under gravel cover soils
AU - Fox, Patrick J.
AU - De Battista, Daniel J.
AU - Mast, David G.
N1 - Funding Information:
This investigation was partially funded by Grant Number CMS-9622644 from the Geomechanical, Geotechnical, Geoenvironmental Systems Program of the U.S. National Science Foundation. This support is gratefully acknowledged. GCL samples were provided by the Colloid Environmental Technologies Company (CETCO) of Arlington Heights, Illinois, USA. The authors sincerely thank Nina Roy-Chowdhury for her assistance with the experimental program.
Copyright:
Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.
PY - 2000/4
Y1 - 2000/4
N2 - Hydraulic performance of adhesive-bonded and needle-punched geotextile-supported geosynthetic clay liners (GCLs) was measured for specimens covered with uniformly graded fine, medium, and coarse gravel using flexible-wall permeameters. Local measurements of specimen thickness, water content, and mass per unit area were taken after each test to quantify thickness variability and bentonite migration/consolidation behavior. Control tests were also performed to measure GCL hydraulic performance under conventional testing conditions. Test results showed that the hydraulic performance of control and gravel-covered specimens of both GCL products improved with increasing confining stress. In addition, measured values of hydraulic conductivity for the gravel-covered specimens were less than the manufacturer's specification. The amount of bentonite migration generally increased with increasing cover soil particle size and rate of loading. Thickness variability and bentonite migration were generally less for the needle-punched product, which is attributed to the additional confinement provided by the reinforcement. The placement of an additional non-woven geotextile over the adhesive-bonded GCL was somewhat effective in reducing thickness variability and bentonite migration under rapid loading conditions. (C) 2000 Elsevier Science Ltd. All rights reserved.
AB - Hydraulic performance of adhesive-bonded and needle-punched geotextile-supported geosynthetic clay liners (GCLs) was measured for specimens covered with uniformly graded fine, medium, and coarse gravel using flexible-wall permeameters. Local measurements of specimen thickness, water content, and mass per unit area were taken after each test to quantify thickness variability and bentonite migration/consolidation behavior. Control tests were also performed to measure GCL hydraulic performance under conventional testing conditions. Test results showed that the hydraulic performance of control and gravel-covered specimens of both GCL products improved with increasing confining stress. In addition, measured values of hydraulic conductivity for the gravel-covered specimens were less than the manufacturer's specification. The amount of bentonite migration generally increased with increasing cover soil particle size and rate of loading. Thickness variability and bentonite migration were generally less for the needle-punched product, which is attributed to the additional confinement provided by the reinforcement. The placement of an additional non-woven geotextile over the adhesive-bonded GCL was somewhat effective in reducing thickness variability and bentonite migration under rapid loading conditions. (C) 2000 Elsevier Science Ltd. All rights reserved.
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U2 - 10.1016/S0266-1144(99)00026-6
DO - 10.1016/S0266-1144(99)00026-6
M3 - Article
AN - SCOPUS:0033999392
SN - 0266-1144
VL - 18
SP - 179
EP - 201
JO - Geotextiles and Geomembranes
JF - Geotextiles and Geomembranes
IS - 2-4
ER -