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Int. J. Environ. Res. Public Health 2011, 8(5), 1692-1706; doi:10.3390/ijerph8051692

Temporal and Spatial Pore Water Pressure Distribution Surrounding a Vertical Landfill Leachate Recirculation Well

1,* , 3
1 Department of Environmental Engineering Sciences, University of Florida, P.O. BOX 116450, Gainesville, FL 32611, USA 2 Environmental Engineer III, CDM, 1601 Belvedere Road, Suite 400 East, West Palm Beach, FL 33406, USA 3 Innovative Waste Consulting Services, LLC, 6628 NW 9th Blvd. Suite 3, Gainesville, FL 32605, USA
* Author to whom correspondence should be addressed.
Received: 2 March 2011 / Revised: 13 May 2011 / Accepted: 13 May 2011 / Published: 24 May 2011
(This article belongs to the Special Issue Advances in Environmental Geotechnics)
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Addition of liquids into landfilled waste can result in an increase in pore water pressure, and this in turn may increase concerns with respect to geotechnical stability of the landfilled waste mass. While the impact of vertical well leachate recirculation on landfill pore water pressures has been mathematically modeled, measurements of these systems in operating landfills have not been reported. Pressure readings from vibrating wire piezometers placed in the waste surrounding a liquids addition well at a full-scale operating landfill in Florida were recorded over a 2-year period. Prior to the addition of liquids, measured pore pressures were found to increase with landfill depth, an indication of gas pressure increase and decreasing waste permeability with depth. When liquid addition commenced, piezometers located closer to either the leachate injection well or the landfill surface responded more rapidly to leachate addition relative to those far from the well and those at deeper locations. After liquid addition stopped, measured pore pressures did not immediately drop, but slowly decreased with time. Despite the large pressures present at the bottom of the liquid addition well, much smaller pressures were measured in the surrounding waste. The spatial variation of the pressures recorded in this study suggests that waste permeability is anisotropic and decreases with depth.
Keywords: landfill; pore pressure; leachate; piezometers; anisotropy; permeability landfill; pore pressure; leachate; piezometers; anisotropy; permeability
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kadambala, R.; Townsend, T.G.; Jain, P.; Singh, K. Temporal and Spatial Pore Water Pressure Distribution Surrounding a Vertical Landfill Leachate Recirculation Well. Int. J. Environ. Res. Public Health 2011, 8, 1692-1706.

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