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Published in: Bulletin of Engineering Geology and the Environment 6/2019

23-10-2018 | Original Paper

An experimental study on the microstructure and triaxial shear of structured clay in contact with landfill leachate

Authors: Shicheng Xu, Haijun Lu, Junzhu Liu, Jixiang Li

Published in: Bulletin of Engineering Geology and the Environment | Issue 6/2019

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Abstract

City solid waste stock has exceeded 8 billion tons in China, and the output and coverage area of solid waste are increasing daily. Landfill leachate can be generated during biodegradation of disposed and stored solid waste. Leachate contains high concentrations of organic mixtures and heavy metal ions. Natural undisturbed soil has high anti-seepage capacity and its permeability coefficient is less than 1 × 10−7 cm/s in underlying stratum, which can delay leachate contamination of the environment surrounding a landfill site. However, undisturbed soil exhibits certain structural characteristics. After long-term leachate corrosion, leachate leakage will inevitably influence the stability of stratum underlying a landfill. In this study, the mechanical characteristics of undisturbed clay under the actions of landfill leachate and stress were analyzed via a consolidated-undrained triaxial shear test. Comprehensive microstructure laboratory tests, including X-ray diffraction, scanning electron microscopy, and laser particle size tests, were performed to determine at different times the microstructure of undisturbed clay due to corrosion by landfill leachate. Experimental results indicate the strength and microstructural evolution of structured clay under the actions of landfill leachate and stress. The research results are helpful for evaluating the safety and predicting the stability of a landfill’s underlying stratum.

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Literature
go back to reference SL 237-1999 (1999) Specification of soil test. China Water Power Press, Beijing. (In Chinese) SL 237-1999 (1999) Specification of soil test. China Water Power Press, Beijing. (In Chinese)
go back to reference Tchobanoglous G, Theisen H, Vigil SA (1993) Integrated solid waste management: engineering principles and management issues. Water Sci Technol Libr 8(1):63–90 Tchobanoglous G, Theisen H, Vigil SA (1993) Integrated solid waste management: engineering principles and management issues. Water Sci Technol Libr 8(1):63–90
Metadata
Title
An experimental study on the microstructure and triaxial shear of structured clay in contact with landfill leachate
Authors
Shicheng Xu
Haijun Lu
Junzhu Liu
Jixiang Li
Publication date
23-10-2018
Publisher
Springer Berlin Heidelberg
Published in
Bulletin of Engineering Geology and the Environment / Issue 6/2019
Print ISSN: 1435-9529
Electronic ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-018-1409-0

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