Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (5): 1389-1397.doi: 10.13278/j.cnki.jjuese.20180156

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Permeability Anisotropy and Microstructure of Yan'an Q3 Loess

Hong Bo1,2, Li Xi'an1, Wang Li1,2, Li Lincui1   

  1. 1. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China;
    2. Key Laboratory of Mine Geological Hazards Mechanism and Control, Shaanxi Institute of Geological Survey, Xi'an 710054, China
  • Received:2018-06-16 Published:2019-10-10
  • Supported by:
    Supported by National Natural Science Foundation of China (41877225, 41572264), Fundamental Research Funds for the Central Universities, CHD (300102268717), Opening Topics of Key Laboratory of Mine Geological Hazards Me-chanism and Control (KF2017-16,KF2017-17)

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Abstract: In order to study the anisotropic permeability of undisturbed loess, Yan'an Q3 loess with obvious anisotropy was chosen as the research object. The vertical and horizontal permeability coefficients of different deep-buried undisturbed loess were measured by variable water head permeability tests in laboratory. The results showed that the vertical permeability coefficient of undisturbed loess was larger than the horizontal permeability coefficient of the same horizon. In addition, both vertical and horizontal permeability coefficients of undisturbed loess decreased with the increase of burial depth of loess, and the anisotropy of undisturbed loess was weakened as the burial depth increased, which indicates that anisotropic undisturbed loess gradually become isotropic with the increase of buried depth. Furthermore, in order to investigate the anisotropy of undisturbed loess from microstructure, the longitudinal and transversal sections of undisturbed loess in different buried depths were characterized by SEM (scanning electron microscopy). It was found that the contact and arrangement of soil particles are the fundamental factors resulting in the anisotropic loess.

Key words: loess, permeability anisotropy, primary porosity, induced porosity, microstructure

CLC Number: 

  • P642.131
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