Modeling the Settlement of Closed Municipal Solid Waste Landfill Based on Physico-chemical and Biodegradable Theory

摘要

Settlement of municipal solid waste (MSW) landfill continues over a long period of time after landfill closure. It occurs due to several complicated mechanisms, such as physical action, chemical action and biological action. It is of great importance to determine or predict the settlement because the settlement may damage foundations and associated facilities built on the 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 traditional settlement models, such as hyperbolic model, exponent mode. Second, a new 3-parameter model for settlement-time relationships is established based on physico-chemical and biodegradable theory, which overcomes the deficiency of traditional settlement models. Third, mathematic proof on relationships among the three models, namely hyperbolic model, exponent mode, and new derived model, is conducted. Finally, comparisons between predicted settlements by 3-parameter model and field measured settlements are performed, and good agreements have been found.