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 land-filled 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.
概要
目 的
帮助填埋场工程方面的学者和工程师更全面地了解城市固体废弃物的沉降机理.
创新点
揭示填埋场城市固体废弃物的沉降机理, 明确沉降计算模型的参数确定方法和不确定因素.
结 论
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1.
填埋场城市固体废弃物的沉降机理不同于传统土体, 这主要是固相颗粒的可压缩性、可降解性以及孔隙流体的可压缩性不同导致的.
-
2.
可以将 沉降划分为瞬时压缩、主压缩、蠕变次压缩和降 解次压缩, 并分别进行计算; 这些计算模型虽然带有经验性, 但具有很好的实用性。
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3.
能更好反映沉降机理的模型需要耦合填埋场城市固体废弃物的降解、压缩和液气运移.
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4.
这些耦合模型能分析更复杂的工况, 但其模型参数的确定更具挑战性.
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The authors are grateful to many colleagues, especially Prof. JK WHITE in University of Southampton, UK and Dr. Hui XU in Zhejiang Sci-Tech University, China for their support.
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William POWRIE and Xiao-bing XU designed the research and processed the corresponding data. David RICHARDS, Liang-tong ZHAN, and Yun-min CHEN contributed to the development of the ideas proposed. William POWRIE and Xiao-bing XU revised and edited the final version.
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William POWRIE, Xiao-bing XU, David RICHARDS, Liang-tong ZHAN, and Yun-min CHEN declare that they have no conflict of interest.
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Project supported by the UK Engineering and Physical Sciences Research Council (No. EP/E041965), the National Basic Research Program (973 Program) of China (No. 2012CB719800), and the Zhejiang Provincial Natural Science Foundation of China (No. LY17E080021)
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Powrie, W., Xu, Xb., Richards, D. et al. Mechanisms of settlement in municipal solid waste landfills. J. Zhejiang Univ. Sci. A 20, 927–947 (2019). https://doi.org/10.1631/jzus.A1900315
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DOI: https://doi.org/10.1631/jzus.A1900315