TECHNICAL NOTES
May 1, 1991
Gas Entrapment in Granular Lenses in Silt/Clay Matrix
Publication: Journal of Geotechnical Engineering
Volume 117, Issue 5
Abstract
This paper presents a mathematical explanation for gas pockets that have been observed in granular lenses contained within silt/clay soils having downward percolating ground-water regimes. It is shown that the introduction of a piezometer into the granular lens can induce partial or total drainage of the lens. This, in turn, can lead to the false conclusion that the deposit in which the piezometer is placed is incompletely saturated when, in fact, it may be fully saturated. Equations are presented that can be used to calculate the anticipated degree of dewatering for specific hydrogeologic conditions. The degree of dewatering, if any, is dependent on the downward gradient through the granular lens, on the vertical distance between the phreatic surface above and the head in the underlying aquifer, and upon the location and thickness of the lens. Engineers are cautioned not to create such artifacts by indiscriminately placing monitor probes around landfills or other construction sites.
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Reference
1.
Moore, C. A. (1990). “Enhancing natural landfill gas migration controls.” 13th Int. Landfill Gas Symp., Governmental Refuse Collection and Disposal Association, Chicago, Ill., 75–85.
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Copyright © 1991 ASCE.
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Published online: May 1, 1991
Published in print: May 1991
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Charles A. Moore, Member, ASCE
Prof. Civ. Engrg., Ohio State Univ., Columbus, OH 43210
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.