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Estimating degradation-related settlement in two landfill-reclaimed soils by sand-salt analogues

McDougall, J.R.; Fleming, I.R.; Thiel, R.; Dewaele, P.; Parker, D.; Kelly, D.

Authors

I.R. Fleming

R. Thiel

P. Dewaele

D. Parker

D. Kelly



Abstract

Landfill reclaimed soil here refers to largely degraded materials excavated from old landfill sites, which after processing can be reinstated as more competent fill, thereby restoring the former landfill space. The success of the process depends on the presence of remaining degradable particles and their influence on settlement. Tests on salt-sand mixtures, from which the salt is removed, have been used to quantify the impact of particle loss on settlement. Where the amount of particle loss is small, say 10% by mass or less, settlements are small and apparently independent of lost particle size. A conceptual model is presented to explain this behaviour in terms of nestling particles and strong force chains. At higher percentages of lost particles, greater rates of settlement together with some sensitivity to particle size were observed. The conceptual model was then applied to two landfill reclaimed soils, the long-term settlements of which were found to be consistent with the conceptual model suggesting that knowledge of particle content and relative size are sufficient to estimate the influence of degradable particles in landfill reclaimed soils.

Citation

McDougall, J., Fleming, I., Thiel, R., Dewaele, P., Parker, D., & Kelly, D. (2018). Estimating degradation-related settlement in two landfill-reclaimed soils by sand-salt analogues. Waste Management, https://doi.org/10.1016/j.wasman.2018.04.013

Journal Article Type Article
Acceptance Date Apr 10, 2018
Online Publication Date Apr 26, 2018
Publication Date 2018-04
Deposit Date Apr 11, 2018
Publicly Available Date Apr 27, 2019
Journal Waste Management
Print ISSN 0956-053X
Publisher Elsevier
Peer Reviewed Peer Reviewed
DOI https://doi.org/10.1016/j.wasman.2018.04.013
Keywords Landfill; settlement; degradation; laboratory testing; field comparison; landfill reclamation
Public URL http://researchrepository.napier.ac.uk/Output/1018306
Contract Date Apr 17, 2018

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