AN IMPROVED FRACTAL PERMEABILITY MODEL FOR POROUS GEOMATERIALS WITH COMPLEX PORE STRUCTURES AND ROUGH SURFACES

Hongyang Ni, Jiangfeng Liu, Xiaozhao Li, Ziheng Sha and Hai Pu
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Hongyang Ni: State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, P. R. China†School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, P. R. China‡Laboratoire de Méchanique, Multiphysique, Multiéchelle (LaMcube), FRE 2016, CNRS, University of Lille, F-59000 Lille, France
Jiangfeng Liu: State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, P. R. China†School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, P. R. China
Xiaozhao Li: State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, P. R. China†School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, P. R. China
Ziheng Sha: State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, P. R. China†School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, P. R. China
Hai Pu: State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, P. R. China†School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, P. R. China

FRACTALS (fractals), 2022, vol. 30, issue 01, 1-13

Abstract: Permeability is a critical parameter for characterizing the migration behavior of a fluid in porous media, thus being of great importance in guiding the geotechnical engineering practice. In this study, an improved permeability model was developed on the basis of the fractal features of the porous geomaterials. It further takes into account the periodic variation of the cross-section of the pore path in the flow direction and the roughness of the pore surfaces. This model indicates that the permeability is a function of the porosity, maximum pore radius, proportion of minimum pore radius to the maximum pore radius, roughness of the capillary tube, and variation in the cross-sectional characteristics of the tube. It provides a better insight into the transport mechanism of fluids in porous geomaterials. The permeability of the model is related to the variable cross-sectional characteristics of the pore channel, i.e. the belly-to-throat ratio and the roughness, as a quadratic function. These two parameters are the key to affecting the level of permeability. The model was verified over a wide range of permeability variations by changing from high-permeability media (102 mD) to low-permeability media (10−3 mD). Accurate permeability prediction of high–low-permeability porous media can be achieved by considering the variation of parameters.

Keywords: Fractal Analysis; Pore Structure; Roughness; Pore Section Variation; Permeability (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1142/S0218348X22500025

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