Applications of soil mechanics principles to landfill waste
Applications of soil mechanics principles to landfill waste
The hydrogeological behaviour of simulated (model) landfill waste was studied in the laboratory, to determine its hydraulic conductivity and suction characteristics. Accurate waste characterisation is vital for predicting and understanding landfill waste behaviour. A methodology was determined for producing a model waste that could be used to assess the applicability of established soil testing methods to waste. Hydraulic conductivity characteristics of model waste were studied in relation to changes in dry density and effective stress. Three scales of tests were used to investigate the effect of particle size / aspect ratio on the hydraulic conductivity characteristics of model waste. It was found that hydraulic conductivity is not affected by the aspect ratio but it is the particle size that influences the permeability characteristics of waste. In general, a Darcian relationship was observed in all the permeability tests and that hydraulic conductivity decreased with the increase in dry density. A similar trend was observed in the case of an applied overburden pressure where effective stress conditions were replicated. The comparison of the hydraulic conductivity characteristics of model to landfill waste showed good correlation with values measured within the range of 10-6 to 10-3 mls. Suction characteristics of waste were studied through the application of the filter paper method. The application of this method was restricted to particle sizes less than 20mm. The experiments showed that model waste behaves similarly to a soil. Waste moisture characteristic curves for various waste dry densities were developed using van Genuchten model. The soil-physical properties / parameters for model waste developed for this investigation were found to be comparable to coarse soils. It also proved that model waste behaves as a consistent material and may be useful in investigating further into the suction characteristics of waste. The filter paper method was found to be susceptible to changes in moisture content, particle size distribution and sensitive to sample preparation. A modified version of the filter paper method for in-situ application to real waste was assessed. The determination of moisture content of waste remained a critical issue. The filter paper technique gave an overestimation of suction values in the presence of pore fluid solute concentrations consistent with those typically present in leachate.
University of Southampton
Imam, Mansoor
1b1c01f5-4403-4d97-b0f3-f1544d6d6944
2003
Imam, Mansoor
1b1c01f5-4403-4d97-b0f3-f1544d6d6944
Imam, Mansoor
(2003)
Applications of soil mechanics principles to landfill waste.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The hydrogeological behaviour of simulated (model) landfill waste was studied in the laboratory, to determine its hydraulic conductivity and suction characteristics. Accurate waste characterisation is vital for predicting and understanding landfill waste behaviour. A methodology was determined for producing a model waste that could be used to assess the applicability of established soil testing methods to waste. Hydraulic conductivity characteristics of model waste were studied in relation to changes in dry density and effective stress. Three scales of tests were used to investigate the effect of particle size / aspect ratio on the hydraulic conductivity characteristics of model waste. It was found that hydraulic conductivity is not affected by the aspect ratio but it is the particle size that influences the permeability characteristics of waste. In general, a Darcian relationship was observed in all the permeability tests and that hydraulic conductivity decreased with the increase in dry density. A similar trend was observed in the case of an applied overburden pressure where effective stress conditions were replicated. The comparison of the hydraulic conductivity characteristics of model to landfill waste showed good correlation with values measured within the range of 10-6 to 10-3 mls. Suction characteristics of waste were studied through the application of the filter paper method. The application of this method was restricted to particle sizes less than 20mm. The experiments showed that model waste behaves similarly to a soil. Waste moisture characteristic curves for various waste dry densities were developed using van Genuchten model. The soil-physical properties / parameters for model waste developed for this investigation were found to be comparable to coarse soils. It also proved that model waste behaves as a consistent material and may be useful in investigating further into the suction characteristics of waste. The filter paper method was found to be susceptible to changes in moisture content, particle size distribution and sensitive to sample preparation. A modified version of the filter paper method for in-situ application to real waste was assessed. The determination of moisture content of waste remained a critical issue. The filter paper technique gave an overestimation of suction values in the presence of pore fluid solute concentrations consistent with those typically present in leachate.
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Published date: 2003
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Local EPrints ID: 465395
URI: http://eprints.soton.ac.uk/id/eprint/465395
PURE UUID: 521107a9-b003-4881-a108-8b9144782938
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Date deposited: 05 Jul 2022 00:42
Last modified: 16 Mar 2024 20:09
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Author:
Mansoor Imam
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