Analysis of the Pore Structure and Fractal Characteristics of Coal and Gas Outburst Coal Seams Based on Matrix Compression Correction

Yabin Gao, Jing Cao (), Shaoqi Zhang and Ziwen Li
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Yabin Gao: School of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Jing Cao: School of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Shaoqi Zhang: School of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Ziwen Li: School of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Sustainability, 2023, vol. 15, issue 17, 1-15

Abstract: The comparative analysis of coal samples under different gas occurrence conditions systematically reveals the pore structure characteristics of coal and gas outburst coal seams. The functional relationship between R 0,max and Kc was clarified using mathematical statistical methods, and the pore structure and fractal characteristics of coal and gas outburst coal seams were analyzed on the basis of modified mercury pressure data and fractal analysis. The results show that the functional relationship between R 0,max and Kc is consistent with y = 1.59x −0.48 , and when the mercury inlet pressure is 10~120 MPa, the coal sample is the most affected by the matrix compression effect. The average pore volume and average specific surface area of the outburst coal samples were 41.71% and 23.09%, which is greater than those of the non-outburst coal samples, respectively, and the specific surface area and pore volume provided by the outburst mining micropores were 46.24% and 81.67%, respectively. The fractal dimension, D, of the coal seam increased with the increase in metamorphism, and compared with low gas mines, the fractal dimension of coal samples in the coal and gas outburst mines was higher, the influence of the matrix compression effect was more obvious, and the heterogeneity was stronger.

Keywords: coal matrix compressibility; data correction; pore structure; fractal feature (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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