Proceedings of GeoShanghai 2018 International Conference: Geoenvironment and Geohazard by Arvin Farid & Hongxin Chen

Author:Arvin Farid & Hongxin Chen
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

Keywords

Compacted clayLandfill leachateTriaxial shear testMicrostructure

1 Introduction

In 2015, Chinese City has 640 landfill disposal facilities and the total of landfill disposal reached 115 million tons, which more than 8 million tons in 2014. The organic matter in garbage disposal and storage is degraded to produce a lot of landfill leachate and methane [1]. The materials for most landfill liners are made up of remolded compacted clay. After longterm influence of leachate corrosion, the strength of landfill liner has changed, which lead to the destruction of landfill liners. The properties of compacted clay presented in landfill leachate are different from that of clay. The strength criterion may not be suitable for compacted clay polluted by landfill leachate. The complexity and randomness of soil microstructure lead to the complexity and randomness of soil macro-mechanical strength.

Scholars have done a lot of research on the microstructure of contaminated soil. Zhao, Nayak et al. [2, 3] found that aggregate structure was destroyed by leachate, causing an increase of smaller pores and a decrease of larger pores, the permeability of clay increased. Cuisinier et al. [4] found that the infiltration and mechanical characteristics of soil with a long period of alkaline solute diffusion changed significantly. Khamehchiyan et al. [5] discovered that the petroleum pollution reduced the strength of sand and clay and the seepage resistance ability. Yong et al. [6] found that the double layer swelling force and the buffering capacity had an important influence on the microstructure of the montmorillonite clay mixture. Compared with the existing research of contaminated soil, the research on microstructure of soil under the coupling of organic pollutants and stress have less been studied. So it is necessary to do further research.

Consolidated-undrained triaxial shear, X-ray diffraction, scanning electron microscopy and laser particle size tests were used to determine mechanical strength characteristics of compacted clay and the corresponding microstructure characteristics under different concentration of leachate and different stress.

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