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Waste Management & Research
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Unsaturated consolidation theory for the prediction of long-term municipal solid waste landfill settlement

Chia-Nan Liu

Civil Engineering Department, National Chi-Nan University, Nantou, Taiwan 545, cnliu{at}ncnu.edu

Rong-Her Chen

Civil Engineering Department, National Taiwan University, Taipei, Taiwan 106

Kuo-Sheng Chen

Civil Engineering Department, National Taiwan University, Taipei, Taiwan 106

The understanding of long-term landfill settlement is important for landfill design and rehabilitation. However, suitable models that can consider both the mechanical and bio-decomposition mechanisms in predicting the long-term landfill settlement are generally not available. In this paper, a model based on unsaturated consolidation theory and considering the biodegradation process is introduced to simulate the landfill settlement behaviour. The details of problem formulations and the derivation of the solution for the formulated differential equation of gas pressure are presented. A step-by-step analytical procedure employing this approach for estimating settlement is proposed. The proposed model can generally model the typical features of short-term and long-term behaviour. The proposed model also yields results that are comparable with the field measurements.

Key Words: Long-term landfill settlement • unsaturated consolidation theory • mechanical settlement • biodegradation process • wmr 819-1

Waste Management & Research, Vol. 24, No. 1, 80-91 (2006)
DOI: 10.1177/0734242X06062579
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