石灰改良黄土渗透性与孔隙结构的关系研究

doi:10.12052/gdutxb.200070

Abstract

Abstract: Soil is a kind of geotechnical engineering material with porous media, and the microscopic pore structure determines macroscopic permeability. To investigate the responsibility between permeability characteristics and pore structure, the falling-head permeability tests at various lime contents are carried on lime-treated loess firstly, and then the Scanning Electron Microscope (SEM) is conducted on some typical specimens which use the Image Pro Plus 6.0 (IPP) Image processing software to count the microscopic pore structure parameters of the improved loess at various lime contents, and, by combining the results of the laboratory permeability test, establish the connection between the macroscopic permeability characteristics and the microscopic pore structure. The results show that with the increase of the lime contents, the crystalline cement filling the large and medium pores is increasing, corresponding to the number, area, surface porosity of the large and medium pores and average diameter of the large pores in the microscopic image are gradually reduced, but the number and area of small and micro pores and the fractal dimension of pores are on the rise, and the pore structure tends to be complicated, which reduces the proportion of effective seepage channels. Therefore the permeability of the soil is reducing. It is indicated that microscopic pore structure parameters are closely related to macroscopic physical properties, which can reflect changes in macroscopic physical properties to a certain extent.

Key words: microscopic pore structure, permeability, lime-treated loess, effective seepage channels, responsibility relationship

CLC Number:

U419.4

Zhang Xue-jiao, Liu Pan, Yang Xue-qiang, Wang Yang. A Study of the Relationship Between Permeability and Pore Structure of Lime-treated Loess[J].Journal of Guangdong University of Technology, 2021, 38(03): 97-103.

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