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Abstract: settlement prediction of municipal solid waste (MSW) is a key issue in the design, construction, and post-closure development of landfills. As MSW is a highly heterogeneous material with compressible and degradable elements, the factors causing compression and settlement are complex. This paper explores the mechanisms and timescales for the settlement of landfilled MSW, and develops a rational taxonomy and framework of understanding. Conceptual models are reviewed and discussed, and the relative importance of different causes of settlement is assessed with reference to new, high quality, datasets and data from the literature.

The reviewed paper listed different mechanisms involved in settlement of municipal solid waste landfills and sorted out three major contributions, immediate consolidation, primary consolidation, and secondary consolidation. However, the lack of discussion on critical physicochemical mechanism that takes place at the particle level (interparticle forces) requires further improvement to compensate the review of settlement mechanisms. Separation of parameters approach systematically indicated the effect of different engineering properties on the consolidation response. On the contrary, the uncertainty of the governing factors remains due to the application of different initial conditions, boundary conditions, and experimental procedures from various research studies. The new coupled model uses physicochemical oriented theoretical foundation to explain the settlement mechanism of municipal solid waster landfills; however, the particle level phenomena need further investigations to help with the establishment of the comprehensive model.

城市固体废弃物填埋场沉降机理

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