Thermal Expansion and Contraction of Geomembrane Liners Subjected to Solar Exposure and Backfilling
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 138, Issue 11
Abstract
Geomembranes (GMBs) are widely used as advective barriers in landfill liner systems. When exposed to the sun, GMBs exhibit a network of wrinkles as a result of thermal expansion. These wrinkles disrupt the intimate contact between the GMB and the underlying layer. If a hole is coincident with a GMB wrinkle then the space under the wrinkle has the potential to act as a preferential pathway for flow of contaminants. Thus, the size and shape of GMB wrinkles have implications for leakage rates through the composite liner system. However, wrinkles are only a concern if they persist after placement of backfill, which is currently a subject of debate. In this paper, wrinkles are induced in a 1.5-mm-thick, black high-density polyethylene strip GMB specimen overlying a geosynthetic clay liner using natural solar and laboratory energy sources. Particle image velocimetry techniques are employed to record cross-sectional wrinkle geometry during growth and subsequent backfilling. This cross-sectional geometry is found to follow a Gaussian shape in which the height increases with the temperature and the width remains relatively constant. The resulting relationships between the height and temperature permit an estimation of wrinkle height for a known coefficient of thermal expansion for the GMB and an estimate of wrinkle spacing. For the GMB material and conditions tested, the results of the backfilling experiments indicate that when covered with 230 mm of cool sand (21°C), wrinkles of initial height less than about 20 mm disappear completely, while larger wrinkles remain with a reduced height. Furthermore, wrinkles of 20 mm in height are observed to form with increases in GMB temperature of less than 5°C. With application to the field, these findings indicate that a GMB must be covered at or below its installation temperature to achieve a wrinkle-free installation.
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Acknowledgments
This work was funded by the Natural Sciences and Engineering Research Council of Canada through the Discovery and Strategic Project Grant programs. The writers wish to acknowledge their Strategic Project Grant partners including Terrafix Geosynthetics, Inc.; Solmax International, Inc.; the Ontario Ministry of the Environment; Canadian Nuclear Regulatory Commission; AECOM; AMEC Earth and Environmental; Golder Associates; Knoght Piesold; CTT Group; Thiel Engineering; and Dr. Grace Hsuan from Drexel University. Funding for equipment was provided by the Canada Foundation for Innovation.
References
Averesch, U., and Schicketanz, R. (1998). “Installation procedure and welding of geomembranes in the construction of composite landfill liner systems: The fixing berm construction method.” Proc., 6th Int. Conf. on Geosynthetics, Industrial Fabrics Association International, St. Paul, MN, 307–313.
Bacas, B. M., Konietzky, H., Berini, J. C., and Sagaseta, C. (2011). “A new constitutive model for textured geomembrane/geotextile interfaces.” Geotext. Geomembr., 29(2), 137–148.
Bonaparte, R., Daniel, D. and Koerner, R. M. (2002). “Assessment and recommendations for improving the performance of waste containment systems.” EPA Rep. CR-821448-01-0, Environmental Protection Agency, Washington, DC.
Brachman, R. W. I., and Gudina, S. (2008). “Geomembrane strains and wrinkle deformations in a GMB/GCL composite liner.” Geotext. Geomembr., 26(6), 488–497.
Brachman, R. W. I., and Sabir, A. (2010). “Geomembrane puncture and strains from stones in an underlying clay layer.” Geotext. Geomembr., 28(4), 335–343.
Chappel, M. J., Brachman, R. W. I., Take, W. A., and Rowe, R. K. (2012). “Large-scale quantification of wrinkles in a smooth black HDPE geomembrane.” J. Geotech. Geoenviron. Eng., 137(6), 671–679.
Chappel, M. J., Take, W. A., Brachman, R. W., and Rowe, R. K. (2008). “A case study of wrinkles in a textured HDPE geomembrane on a slope.” Proc., 1st Pan American Geosynthetics Conf. and Exhibition, Industrial Fabrics Association International, St. Paul, MN, 452–458.
Chen, Y., Lin, W., and Zhan, T. L. T. (2010). “Investigation of mechanisms of bentonite extrusion from GCL and related effects on the shear strength of GCL/GM interfaces.” Geotext. Geomembr., 28(1), 63–71.
Dickinson, S., and Brachman, R. W. I. (2008). “Assessment of alternative protection layers for a GM/GCL composite liner.” Can. Geotech. J., 45(11), 1594–1610.
Eid, H. T. (2011). “Shear strength of geosynthetic composite systems for design of landfill liner and cover slopes.” Geotext. Geomembr., 29(3), 335–344.
Giroud, J. P. (2005). “Quantification of geosynthetic behavior.” Geosynthet. Int., 12(1), 2–27.
Giroud, J. P., and Morel, N. (1992). “Analysis of geomembrane wrinkles.” Geotext. Geomembr., 11 (3), 255–276.
Gudina, S., and Brachman, R. W. I. (2006). “Physical response of geomembrane wrinkles overlying compacted clay.” J. Geotech. Geoenviron. Eng., 132(10), 1346–1353.
Gudina, S., and Brachman, R. W. I. (2011). “Geomembrane strains from wrinkle deformations.” Geotext. Geomembr., 29(2), 181–189.
Koerner, R. M. (1998). Designing with geosynthetics, 4th Ed., Prentice Hall, Upper Saddle River, NJ.
Müller, W. (2007). HDPE geomembranes in geotechnics, Springer, Berlin.
Pelte, T., Pierson, P., and Gourc, J. P. (1994). “Thermal analysis of geomembranes exposed to solar radiation.” Geosynthet. Int., 1(1), 21–44.
Rowe, R. K. (1998). “Geosynthetics and the minimization of contaminant migration through barrier systems beneath solid waste.” Proc., 6th Int. Conf. on Geosynthetics, Industrial Fabrics Association International, St. Paul, MN, 27–103.
Rowe, R. K. (2005). “Long-term performance of contaminant barrier systems.” Geotechnique, 55(9), 631–678.
Rowe, R. K., Quigley, R. M., Brachman, R. W. I., and Booker, J. R. (2004). Barrier systems for waste disposal facilities, Taylor & Francis, London.
Scheirs, J. (2009). A guide to polymeric geomembranes: A practical approach, Wiley, Chichester, U.K.
Soong, T.-Y., and Koerner, R. M. (1998). “Laboratory study of high density polyethylene geomembrane waves.” Proc., Int. Conf. on Geosynthetics, Vol. 1, Industrial Fabrics Association International, St. Paul, MN, 301–306.
Stone, J. L. (1984). “Leakage monitoring of the geomembrane for proton decay experiment.” Proc., Int. Conf. on Geomembranes, Vol. 2, Industrial Fabrics Association International, St. Paul, MN, 475–480.
Take, W. A., Chappel, M. J., Brachman, R. W. I., and Rowe, R. K. (2007). “Quantifying geomembrane wrinkles using aerial photography and digital image processing.” Geosynthet. Int., 14(4), 219–227.
Tognon, A. R., Rowe, R. K., and Moore, I. D. (2000). “Geomembrane strain observed in large-scale testing of protection layers.” J. Geotech. Geoenviron. Eng., 126(12), 1194–1208.
White, D. J., Take, W. A., and Bolton, M. D. (2003). “Soil deformation measurement using particle image velocimetry (PIV) and photogrammetry.” Geotechnique, 53(7), 619–631.
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© 2012 American Society of Civil Engineers.
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Received: Apr 12, 2011
Accepted: Jan 9, 2012
Published online: Jan 11, 2012
Published in print: Nov 1, 2012
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