Effect of GCL Type on Downslope Erosion in an Exposed Composite Liner
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 142, Issue 12
Abstract
Downslope bentonite erosion in four geosynthetic clay liners (GCLs) with granular bentonite (denoted GCL1–GCL4) left covered only by a black high-density polyethylene (HDPE) geomembrane for 3.6 and 4.7 years was recently published. Reported herein are the results of a field study of the potential for erosion for seven new test sections over a 28-month period. These include four previously unstudied GCLs: two with powdered bentonite (GCL5 and GCL6), one with polymer-enhanced granular bentonite (GCL7), and one multicomponent product installed coating-up (GCL8). One GCL (GCL2) known to experience erosion below an exposed black geomembrane was installed beneath both a black and a white exposed geomembrane and also in a section where the composite liner was promptly covered by 0.3 m of gravel. After 28 months, there was significant erosion of GCL2 and GCL7, but no significant erosion of GCL5, GCL6, GCL8, or GCL2 covered by 0.3 m gravel.
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Acknowledgments
This research was financially supported by Terrafix Geosynthetics Inc., GSE Inc., Naue GmbH & Co. KG, TAG Environmental Inc., Terrafix Environmental Technologies Inc., and the Natural Science and Engineering Research Council of Canada (NSERC). The Queen’s University Environmental Liner Test Site was constructed on land owned by Cruickshank Construction Ltd. The authors would like to acknowledge the graduate students and summer students who helped during the field investigations for generously offering their time and assistance and a special thanks to Dr. Mohamed Hosney for obtaining the mass per unit area of the polymer coating on GCL8.
References
Ashe, L., Rowe, R. K., Brachman, R. W. I., and Take, W. A. (2014). “Laboratory study of downslope erosion for ten different GCLs.” J. Geotech. Geoenviron. Eng., 04014079.
Bostwick, L. E. (2009). “Laboratory study of geosynthetic clay liner shrinkage when subjected to wet/dry cycles.” M.Sc. thesis, Queen’s Univ., Kingston, ON, Canada.
Brachman, R. W. I., Rentz, A., Rowe, R. K., and Take, W. A. (2015). “Classification and quantification of downslope erosion from a GCL when covered only by a black geomembrane.” Can. Geotech. J., 52(4), 395–412.
Brachman, R. W. I., Rowe, R. K., Take, W. A., Arnepalli, D. N., and Chappel, M. (2007). “Queen’s composite geosynthetic liner experimental site.” Proc., 60th Canadian Geotechnical Conf., Canadian Technical Society, Ottawa, 2135–2142.
Naue GmBk & Co KG. (2009). “Bentofix installation guideline 02a/2009.” 〈http://www.naue.com/en/products/bentofix.html〉.
Perry, R. H., and Green, D. W. (2008). Perry’s chemical engineers’ handbook, 8th Ed., McGraw-Hill, New York.
Rayhani, M. T., Rowe, R. K., Brachman, R. W. I., Take, W. A., and Siemens, G. (2011). “Factors affecting GCL hydration under isothermal conditions.” Geotext. Geomembr., 29(6), 525–533.
Rentz, A. K., Take, W. A., Brachman, R. W. I., and Rowe, R. K. (2015). “Effect of geomembrane colour and cover soil on exposure conditions and downslope bentonite erosion from a GCL.” Geosynth. Int., in press.
Rowe, R. K. (2005). “Long-term performance of contaminant barrier systems.” Geotechnique, 55(9), 631–678.
Rowe, R. K. (2012). “Short and long-term leakage through composite liners.” Can. Geotech. J., 49(2), 141–169.
Rowe, R. K., Ashe, L. E., Take, W. A., and Brachman, R. W. I. (2014a). “Factors affecting the down-slope erosion of bentonite in a GCL.” Geotext. Geomembr., 42(5), 445–456.
Rowe, R. K., Chappel, M. J., Brachman, R. W. I., and Take, W. A. (2012). “Field monitoring of geomembrane wrinkles at a composite liner test site.” Can. Geotech. J., 49(10), 1196–1211.
Rowe, R. K., Take, W. A., Brachman, R. W. I., and Rentz, A. (2014b). “Field observations of moisture migration on GCLs in exposed liners.” Proc., 10th Int. Geoysnthetics Conf., International Geosynthetics Society, Jupiter, FL.
Rowe, R. K., Take, W. A., Brachman, R. W. I., and Rentz, A. (2014c). “Observations of down-slope moisture migration on GCLs beneath exposed GMB liners.” Proc., 10th Int. Geosynthetics Conf., Berlin.
Stark, T. D., Choi, H., and Akhtarshad, R. (2004). “Occurrence and effect of bentonite migration in geosynthetic clay liners.” Geosynth. Int., 11(4), 296–310.
Take, W. A., Brachman, R. W. I., and Rowe, R. K. (2015a). “Observations of bentonite erosion from solar-driven moisture migration in GGLs covered only by a black geomembrane.” Geosynth. Int., 22(1), 78–92.
Take, W. A., Rowe, R. K., Brachman, R. W. I., and Arnepalli, D. N. (2015b). “Thermal exposure conditions for a composite liner with a black geomembrane exposed to solar radiation.” Geosynth. Int., 22(1), 93–109.
Thiel, R., Giroud, J. P., Erickson, R., Criley, K., and Bryk, J. (2006). “Laboratory measurements of GCL shrinkage under cyclic changes in temperature and hydration conditions.” Proc., 8th Int. Geosynthetics Conf., International Geosynthetics Society, Jupiter, FL, 21–44.
Thiel, R., and Richardson, G. (2005). “Concern for GCL shrinkage when installed on slopes.” JGRI-18 at GeoFrontiers, GII Publications, Folsom, PA.
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© 2016 American Society of Civil Engineers.
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Received: Jun 23, 2015
Accepted: Apr 26, 2016
Published online: Jul 19, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 19, 2016
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