Gas Permeability of Partially Hydrated Geosynthetic Clay Liners
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 130, Issue 1
Abstract
A series of gas permeability tests were performed on four partially hydrated geosynthetic clay liners (GCLs) (GCL1, GCL2, GCL3, and GCL4). All GCLs consisted of essentially dry bentonite (powder or granular) sandwiched between geotextile layers. The geotextiles were held together as a composite material by needle-punching, except GCL-4, which was stitch bonded. GCL-2 had a special characteristic, which consisted of a cover nonwoven geotextile layer impregnated with powdered bentonite. The gas permeability was found to be very sensitive to the change of moisture content and volumetric water content. The results also highlighted the effects of the GCL structures (bentonite impregnation, needle punching, and stitch bonding) and bentonite forms (granular and powdered) on the gas permeability. The needle punched GCLs tended to have lower gas permeability than the stitch bonded GCLs, and the GCLs containing granular bentonite tended to have higher gas permeability than the GCLs containing powdered bentonite. The bentonite impregnation of the nonwoven geotextile also contributed to lower gas permeability. For comparable conditions, these effects resulted in a reduction of up to three orders of magnitude of gas permittivity from one GCL to another. However, the effect of the differences between the GCLs on gas permeability, at high volumetric water content was overridden by the presence of the overburden pressure during hydration. Furthermore, the overburden pressure also had an important role in the reduction of gas permeability, which implies that the GCL should be subjected to confinement at the time of installation or hydration in order to obtain a low gas permeability.
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References
Alzaydi, A. A., and Moore, C. A.(1978). “Combined pressure and diffusional transition region flow of gases in porous media.” Am. Inst. Chem. Eng. J., 24(1), 35–43.
Bear, J. (1972). Dynamics of fluids in porous media, Dover, New York.
Bouazza, A.(2002). “Geosynthetic clay liners.” Geotext. Geomembr., 20(1), 3–17.
Bouazza, A., and Vangpaisal, T. (2000). “Advective gas flux through partially saturated geosynthetic clay liners.” Advances in transportation and geoenvironmental engineering systems using geosynthetics, Geotechnical Special Publication No. 103, 54–67.
Bouazza, A., and Vangpaisal, T.(2003). “An apparatus to measure gas permeability of geosynthetic clay liners.” Geotext. Geomembr., 21(2), 85–101.
Brusseau, M. L.(1991). “Transport of organic chemicals by gas advection in structured or heterogeneous porous media: Development of a model and application to column experiments.” Water Resour. Res., 27(12), 3189–3199.
Dakshanamurthy, V.(1978). “A new method to predict swelling using a hyperbolic equation.” Geotech. Eng., 9(1), 29–38.
Didier, G., Bouazza, A., and Cazaux, D.(2000). “Gas permeability of geosynthetic clay liners.” Geotext. Geomembr., 18(2), 235–250.
Didier, G., and Comeaga, L. (1997). “Influence of initial hydration conditions on GCLs leachate permeability.” Testing and acceptance criteria for geosynthetic clay liners, ASTM STP 1308, Philadelphia, 181–195.
Dullien, F. A. L.(1975). “Single phase flow through porous media and pore structure.” Chem. Eng. J., 10, 1–34.
Egloffstein, T. A. (2000). “Natural bentonites—Influence of the ion exchange and partial desiccation on permeability and self healing capacity of bentonites used in GCLs.” Proc. 14th GRI Conf.: Hot Topics in Geosynthetics—I., Las Vegas, GRI, Philadelphia, 164–188.
Gilbert, R. B., Fernandez, F., and Horsfield, D. W.(1996). “Shear strength of reinforced geosynthetic clay liner.” J. Geotech. Eng., 122(4), 259–266.
Izadi, M. T., and Stephenson, R. W. (1992). “Measurement of gas permeability through clay soils.” Current practices in ground water and vadose zone investigations, ASTM STP 1118, Philadelphia, 3–20.
Jarre, P., Mezzalama, R., and Luridiana, A. (1997). “Lessons to be learned from a fatal landfill gas explosion.” Proc., 6th Int. Landfill Symp., Cagliari, CISA, Italy, 497–506.
Kjeldsen, P., and Fisher, E. V.(1995). “Landfill gas migration—Field investigations at skellingsted landfill, Denmark.” J. Waste Manage. Res., 13, 467–484.
Koerner, R. M., and Daniel, D. E. (1997). Final covers for solid waste landfills and abandoned dumps, ASCE, New York.
Lake, C. B., and Rowe, R. K.(2000). “Diffusion of sodium and chloride through geosynthetic clay liners.” Geotext. Geomembr., 18(2–4), 103–131.
Massman, J. W.(1989). “Applying groundwater flow models in vapor extraction system design.” J. Environ. Eng., 115(1), 129–149.
McBean, E. A., Rovers, F. A., and Farquhar, G. J., (1995). “Solid waste landfill: Engineering and design.” Prentice-Hall PTR, Englewood Cliffs, N.J.
Shelp, M. L., and Yanful, E. K.(2000). “Oxygen diffusion coefficient of soils at high degrees of saturation.” Geotech. Test. J., 23(1), 36–44.
Sherman, V. W. (2000). “GCL durability and lifetime—A state’s perception.” Proc. 14th GRI Conf.: Hot Topics in Geosynthetics—I., Las Vegas, GRI, Philadelphia, 238–241.
Thiel, R. (1999). “Design of a gas pressure relief layer below a geomembrane cover to improve slope stability.” Proceedings Geosynthetics’99, Boston, IFAI, Roseville, Minn., 235–251.
Vangpaisal, T., and Bouazza, A. (2001). “Gas permeability of three needle punched geosynthetic clay liners.” Proc., 2nd ANZ Conf. on Environmental Geotechnics, Newcastle, Australia, AGS, Canberra, Australia, 373–378.
Williams, G. M., and Aitkenhead, N.(1991). “Lessons from Loscoe: The uncontrolled migration of landfill gas.” Q. J. Eng. Geol., 24, 191–207.
Yanful, E. K.(1993). “Oxygen diffusion through soil covers on sulphidic mine tailings.” J. Geotech. Eng., 119(8), 1207–1228.
Information & Authors
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 130 • Issue 1 • January 2004
Pages: 93 - 102
Copyright
Copyright © 2004 American Society of Civil Engineers.
History
Received: Feb 28, 2002
Accepted: Dec 17, 2002
Published online: Dec 15, 2003
Published in print: Jan 2004
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