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Updated: Sep 15, 2025

A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
Published on: June 12, 2019
Constitutive relationship between pore-permeability and molecular structure of bituminous coal based on the
Mingkun Pang1,2, Tianyu Zhang1, Lin Li1
1College of Safety Science and Engineering, Xi'an University of Science and Technology, Xi'an, China.
Abstract:
The cell structure of three different densities of bituminous coal molecules was modeled and optimized by using Material Studio (MS) to reveal the mathematical relationship between the porosity and permeability of bituminous coal. The internal surface area was analyzed using the Connolly Surface module, and the specific surface area of the molecules was obtained by mass conversion; the grey processing method was used to evaluate the cell structure porosity, and the pore-permeability constitutive relationship of bituminous coal molecules was established by drawing on the Kozeny-Carman (KC) equation. The results show that the maximum value of 0.29 appears near the pore size of 2.01 Å; Porosity is the main factor affecting its permeability, and the permeability decreases with increasing porosity. The relationship between porosity and permeability was obtained by regression analysis as follows: K = 161 [Formula: see text] 2.1/(1 + 12 [Formula: see text] 2.1). This study provides a new method for the calculation of permeability of porous media.
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