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CLC number: TU43

On-line Access: 2019-12-09

Received: 2019-07-08

Revision Accepted: 2019-11-03

Crosschecked: 2019-11-30

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Xiao-bing Xu

https://orcid.org/0000-0002-2355-2102

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Journal of Zhejiang University SCIENCE A 2019 Vol.20 No.12 P.927-947

10.1631/jzus.A1900315


Mechanisms of settlement in municipal solid waste landfills


Author(s):  William Powrie, Xiao-bing Xu, David Richards, Liang-tong Zhan, Yun-min Chen

Affiliation(s):  School of Engineering, University of Southampton, Southampton SO17 1BJ, UK; more

Corresponding email(s):   xiaobingxu@zjut.edu.cn

Key Words:  Municipal solid waste (MSW), Compression, Settlement, Creep, Degradation


William Powrie, Xiao-bing Xu, David Richards, Liang-tong Zhan, Yun-min Chen. Mechanisms of settlement in municipal solid waste landfills[J]. Journal of Zhejiang University Science A, 2019, 20(4): 927-947.

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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

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: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. 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. 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.

关键词:城市固体废弃物; 降解; 沉降; 压缩; 蠕变

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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