Reductions in GCL Overlap Beneath an Exposed Geomembrane
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 144, Issue 12
Abstract
Reductions in geosynthetic clay liner (GCL) panel overlap are reported for two needle-punched and thermally treated GCLs (GCL1 and GCL2) and compared with values for two other needle-punched but not thermally treated GCLs (GCL3 and GCL4) at the same field-scale test site. The GCLs were covered only by a black geomembrane and otherwise left exposed to study the implications of leaving the composite liner exposed for nearly 5 years on reductions in the overlapped seams between adjacent GCL panels. It was found that all but GCL2 experienced a significant reduction in overlap. After 4.8 years, GCL2 experienced the smallest overlap reductions of only 30 mm (i.e., 90% of the initial 300 mm panel overlap remained), GCL3 overlaps were reduced by 75 mm, whereas GCL1 and GCL4 had the largest reductions with values greater than 600 and 400 mm, respectively, after 4.8 years. Overlap reductions appear to correlate with reference water content and overlap adhesion, which are two laboratory indices affected by confinement and texture of the four GCLs resulting from subtle, but, distinct differences in the method of manufacture.
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Acknowledgments
QUELTS was funded by the Natural Sciences and Engineering Research Council of Canada (NSERC) with support from the Ontario Ministry of the Environment, Terrafix Geosynthetics, TAG Environmental, and Solmax International. The geosynthetics were installed by Terrafix Environmental Technologies consistent with normal industry practice. They also assisted with opening and closing of the geomembrane for field inspections. Independent inspection and testing by the authors showed that all geosynthetics were in good condition on installation. The installation was continuously monitored/inspected/checked by the authors.
References
Beddoe, R. A., W. A. Take, and R. K. Rowe. 2011. “Water-retention behavior of geosynthetic clay liners.” J. Geotech. Geoenviron. Eng. 137 (11): 1028–1038. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000526.
Bostwick, L., R. K. Rowe, W. A. Take, and R. W. I. Brachman. 2010. “Anisotropy and directional shrinkage of geosynthetic clay liners.” Geosynthetics Int. 17 (3): 157–170. https://doi.org/10.1680/gein.2010.17.3.157.
Bouazza, A., M. A. Ali, W. P. Gates, and R. K. Rowe. 2017. “New insight on geosynthetic clay liner hydration: The key role of subsoils mineralogy.” Geosynthetics Int. 24 (2): 139–150. https://doi.org/10.1680/jgein.16.00022.
Bouazza, A., and W. P. Gates. 2014. “Overview of performance compatibility issues of GCLs with respect to leachates of extreme chemistry.” Geosynthetics Int. 21 (2): 151–167. https://doi.org/10.1680/gein.14.00006.
Brachman, R. W. I., S. Gudina, R. K. Rowe, and W. A. Take. 2010. “Adhesion from supplemental bentonite placed at GCL overlaps.” In Proc., 63rd Canadian Geotechnical Conf. Calgary, AB, Canada: Canadian Geotechnical Society.
Brachman, R. W. I., P. Joshi, and R. K. Rowe. 2016. “Hydraulic performance of overlapped geosynthetic clay liner seams requiring field-applied supplemental bentonite.” J. Geotech. Geoenviron. Eng. 142 (12): 04016067. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001566.
Brachman, R. W. I., A. Rentz, R. K. Rowe, and W. A. Take. 2015. “Classification and quantification of downslope erosion from a GCL when covered only by a black geomembrane.” Can. Geotech. J. 52 (4): 395–412. https://doi.org/10.1139/cgj-2014-0241.
Brachman, R. W. I., R. K. Rowe, W. A. Take, D. Arnepalli, M. Chappel, L. Bostwick, and R. Beddoe. 2007. “Queen’s geosynthetic liner site.” In Proc., 60th Canadian Geotechnical Conf., 2135–2142. Calgary, AB, Canada: Canadian Geotechnical Society.
Brachman, R. W. I., R. K. Rowe, W. A. Take, and L. Ashe. 2014. “Comparison of field and laboratory measurements of GCL shrinkage.” In Proc., 10th Int. Conf. Geosynthetics. Berlin: International Geosynthetics Society.
Chevrier, B., D. Cazaux, G. Didier, M. Gamet, and D. Guyonnet. 2012. “Influence of subgrade, temperature and confining pressure on GCL hydration.” Geotext. Geomembr. 33: 1–6. https://doi.org/10.1016/j.geotexmem.2012.02.003.
Estornell, P., and D. E. Daniel. 1992. “Hydraulic conductivity of three geosynthetic clay liners.” J. Geotech. Eng. 118 (10): 1592–1606. https://doi.org/10.1061/(ASCE)0733-9410(1992)118:10(1592).
Hosney, M. S., and R. K. Rowe. 2013. “Changes in geosynthetic clay liner (GCL) properties after 2 years in a cover over arsenic-rich tailings.” Can. Geotech. J. 50 (3): 326–342. https://doi.org/10.1139/cgj-2012-0367.
Koerner, R. M., and G. R. Koerner. 2005a. In-situ separation of GCL panels beneath exposed geomembranes, 21. Folsom, PA: Geosynthetic Institute.
Koerner, R. M., and G. R. Koerner. 2005b. “In-situ separation of GCL panels beneath exposed geomembranes.” Geotech. Fabr. Rep. 23 (5): 34.
Lake, C. B., and R. K. Rowe. 2000. “Swelling characteristics of needle-punched, thermally treated geosynthetic clay liners.” Geotext. Geomembr. 18 (2): 77–101. https://doi.org/10.1016/S0266-1144(99)00022-9.
Rayhani, M. H. T., R. K. Rowe, R. W. I. Brachman, W. A. Take, and G. Siemens. 2011. “Factors affecting GCL hydration under isothermal conditions.” Geotext. Geomembr. 29 (6): 525–533. https://doi.org/10.1016/j.geotexmem.2011.06.001.
Rentz, A. K., W. A. Take, R. W. I. Brachman, and R. K. Rowe. 2016. “Effect of geomembrane colour and cover soil on solar-driven down-slope bentonite erosion from a GCL.” Geosynthetics Int. 23 (4): 257–270. https://doi.org/10.1680/jgein.15.00050.
Rowe, R. K. 2012. “Short and long-term leakage through composite liners: The 7th Arthur Casagrande lecture.” Can. Geotech. J. 49 (2): 141–169. https://doi.org/10.1139/t11-092.
Rowe, R. K., and K. Abdelatty. 2012. “Effect of a calcium-rich soil on the performance of an overlying GCL.” J. Geotech. Geoenviron. Eng. 138 (4): 423–431. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000614.
Rowe, R. K., L. E. Bostwick, and W. A. Take. 2011a. “Effect of GCL properties on shrinkage when subjected to wet-dry cycles.” J. Geotech. Geoenviron. Eng. 137 (11): 1019–1027. https://doi.org/10.1061/(ASCE)GT.1943-5606.0000522.
Rowe, R. K., R. W. I. Brachman, M. S. Hosney, W. A. Take, and D. N. Arnepalli. 2017. “Insight into hydraulic conductivity testing of geosynthetic clay liners (GCLs) exhumed after 5 and 7 years in a cover.” Can. Geotech. J. 54 (8): 1118–1138. https://doi.org/10.1139/cgj-2016-0473.
Rowe, R. K., R. W. I. Brachman, and W. A. Take. 2018. “Field measurements of overlap reductions for two reinforced fabric-encased GCLs.” Can. Geotech. J. 55 (5): 631–639. https://doi.org/10.1139/cgj-2017-0375.
Rowe, R. K., M. J. Chappel, R. W. I. Brachman, and W. A. Take. 2012. “Field study of wrinkles in a geomembrane at a composite liner test site.” Can. Geotech. J. 49 (10): 1196–1211. https://doi.org/10.1139/t2012-083.
Rowe, R. K., R. M. Quigley, R. W. I. Brachman, and J. R. Booker. 2004. Barrier systems for waste disposal facilities, 587. London: Taylor & Francis.
Rowe, R. K., M. H. T. Rayhani, W. A. Take, G. Siemens, and R. W. I. Brachman. 2011b. “GCL hydration under simulated daily thermal cycles.” Geosynthetics Int. 18 (4): 196–205. https://doi.org/10.1680/gein.2011.18.4.196.
Rowe, R. K., M. T. Rayhani, W. A. Take, G. Siemens, and R. W. I. Brachman. 2013. “Physical modelling of nonwoven/nonwoven GCL shrinkage under simulated field conditions.” Geotext. Geomembr. 40: 12–19. https://doi.org/10.1016/j.geotexmem.2013.07.008.
Rowe, R. K., A. Rentz, R. W. I. Brachman, and W. A. Take. 2016. “Effect of GCL type on downslope erosion in an exposed composite liner.” J. Geotech. Geoenviron. Eng. 142 (12): 04016074. https://doi.org/10.1061/(ASCE)GT.1943-5606.0001565.
Shackelford, C. D., C. H. Benson, T. Katsumi, T. B. Edil, and L. Lin. 2000. “Evaluating the hydraulic conductivity of GCLs permeated with non-standard liquids.” Geotext. Geomembr. 18 (2–4): 133–161. https://doi.org/10.1016/S0266-1144(99)00024-2.
Siemens, G., W. A. Take, R. K. Rowe, and R. W. I. Brachman. 2012. “Numerical investigation of transient hydration of unsaturated geosynthetic clay liners.” Geosynthetics Int. 19 (3): 232–251. https://doi.org/10.1680/gein.12.00011.
Take, W. A., R. W. I. Brachman, and R. K. Rowe. 2015a. “Observations of bentonite erosion from solar-driven moisture migration in GCLs covered only by a black geomembrane.” Geosynthetics Int. 22 (1): 78–92. https://doi.org/10.1680/gein.14.00033.
Take, W. A., R. K. Rowe, R. W. I. Brachman, and D. N. Arnepalli. 2015b. “Thermal exposure conditions for a composite liner with a black geomembrane exposed to solar radiation.” Geosynthetics Int. 22 (1): 93–109. https://doi.org/10.1680/gein.14.00034.
Thiel, R., J. P. Giroud, R. Erickson, K. Criley, and J. Bryk. 2006. “Laboratory measurements of GCL shrinkage under cyclic changes in temperature and hydration conditions.” In Proc., 8th Int. Conf. Geosynthetics, 21–44. Jupiter, FL: International Geosynthetics Society.
Thiel, R., and G. Richardson. 2005. “Concern for GCL shrinkage when installed on slopes.” In Vol. 2 of Proc., 18th Annual GRI Conf. at Geofrontiers. Folsom, PA: Geosynthetic Institute.
Thiel, R., and R. K. Rowe. 2010. “Technical developments related to the problem of GCL panel shrinkage when placed below an exposed geomembrane.” In Proc., 3rd Int. Symp. GCLs, 15–16. Würzburg, Germany.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 144 • Issue 12 • December 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jul 3, 2017
Accepted: Jun 14, 2018
Published online: Oct 4, 2018
Published in print: Dec 1, 2018
Discussion open until: Mar 4, 2019
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