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An Experimental Study of Mineral and Microstructure for Undisturbed Loess Polluted by Landfill Leachate

  • Geotechnical Engineering
  • Published:
KSCE Journal of Civil Engineering Aims and scope

Abstract

To investigate the shear strength and microstructure of undisturbed loess polluted by landfill leachate, a series of laboratory tests were carried out to determine the shear strength, mineral composition, surface morphology, particle size distribution and pore characteristics of the loess. The stress-strain curve of undisturbed soil polluted by landfill leachate showed typical strain-softening behavior. The deviatoric stress, cohesion and angle of shearing resistance of undisturbed soil decreased at increased landfill leachate concentrations, decreased by 31.03%, 30.01%, respectively. But pore water pressure was positively related to leachate concentrations. The content of primary minerals remained stable, and the content of montmorillonite and illite decreased with increased leachate concentration, reduced by 26.02%, 23.93%, respectively. Soil structure changed into an unstable honeycomb structure when the leachate concentration increased. Moreover, the average particle size decreased by 62.1%, and the specific surface area increased and then stabilized at 500 ~ 650 m2/kg. The soil particles became nonuniform and porous and their sizes gradually decreased. The pore radius of soil mainly ranged from 0.02 μm to 1 μm. The maximum radius and optimal radius of the pore increased when the leachate concentrations increased.

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Authors and Affiliations

  1. School of Civil Engineering and Architecture, Wuhan Polytechnic University, Wuhan, 430023, China

    Haijun Lu, Shicheng Xu, Dinggang Li & Jixiang Li

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  1. Haijun Lu
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Correspondence to Shicheng Xu.

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Lu, H., Xu, S., Li, D. et al. An Experimental Study of Mineral and Microstructure for Undisturbed Loess Polluted by Landfill Leachate. KSCE J Civ Eng 22, 4891–4900 (2018). https://doi.org/10.1007/s12205-017-1799-8

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