Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (11): 3632-3640.doi: 10.16285/j.rsm.2020.5093

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Study on the microscopic characteristics of three-dimensional pores in coral sand

CUI Xiang1, 2, HU Ming-jian1, ZHU Chang-qi1, WANG Ren1, WANG Xin-zhi1, WANG Tian-min1, 2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China 2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Online:2020-11-10 Published:2021-04-08
  • About author:CUI Xiang, male, born in 1993, Doctoral candidate, mainly engaged in the research of underground freshwater lenses on coral reefs.
  • Supported by:
    the National Natural Science Foundation of China (41877271, 41572304) and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA13010301)

Abstract: The pore is the place where the seepage occurs in the porous medium, which is inevitably related to the permeability of the medium. Due to the special material source and formation process, coral sand has completely different pore characteristics compared with terrestrial sand. Through a series of microscopic studies, the reason for the special pore properties of coral sand in essence was revealed. It is found that it is reasonable to describe the properties of pores from the aspect of pore shape, pore throat size and global connectivity. Among them, pore shape is measured by the shape factor. Pore throat size includes pore radius and throat radius. Global connectivity in the porous media is described by coordination numbers. Particle shape and particle surface roughness are the main factors affecting pore shape, pore throat size and global connectivity. Particle shape mainly affects pore shape, throat size, pore throat size dispersion and the uniform distribution of connectivity in the medium. Particle surface roughness mainly affects pore shape, pore shape dispersion, pore size and global connectivity in the porous medium.

Key words: coral sand, quartz sand, microscopic angle, particle morphology, pore properties