A New Model for Settlement Process of Closed Municipal Solid Waste Landfill   Wang, Wei Department of Civil Engineering, Shaoxing University, Shaoxing, China; e-mail: wellsking.wang@gmail.com
			ABSTRACT

Settlement of municipal solid waste (MSW) landfill continues over a long period time after landfill closure because of several complicated mechanisms, such as physical action, chemical action and biological action. It is of great importance to determine or predict the settlement because it may damage foundations and associated facilities built on top of the landfill. In this paper, the time-dependent settlement of closed MSW landfill is analyzed. First, half-value-settlement time of model function is adopted to study the deficiency of such traditional settlement models, as hyperbolic and exponent models. Second, a new 3-parameter model for settlement-time relationship is established based on physico-chemical and biodegradable theory, which overcomes the deficiency of the traditional settlement models. Finally, mathematical proof on relationship is carried out among the hyperbolic model, exponent model, and the new proposed model. The hyperbolic and exponent function settlement models are the lower bound and the upper bound of the proposed 3-parameter settlement model, respectively. The proposed model can cover the whole area enclosed by two traditional settlement models. This new settlement model may be helpful to the design, management and reutilization of corresponding municipal solid waste landfills.

Keywords: Settlement model; Geotechnical property; Municipal wastes; Landfill.

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