Study on pore structure and fractal characteristics of coal samples with different gas content based on modified MIP

被引：0
|
作者：
Guo Y. [1 ,2 ]
Gao Y. [1 ,2 ]
Cao J. [1 ,2 ]
Zhang S. [1 ,2 ]
Li Z. [1 ,2 ]
机构：
[1] School of Safety and Emergency Management Engineering, Taiyuan University of Technology, Shanxi, Taiyuan
[2] Graduate Education Innovation Center for Shanxi Coal Mine Safety, Taiyuan University of echnology, Shanxi, Taiyuan
来源：
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | 2023年 / 52卷 / 06期
关键词：
fractal characteristics; high gas outburst coal seam; MIP correction; pore structure;
D O I：
10.13247/j.cnki.jcumt.20230449
中图分类号：
学科分类号：
摘要：
In recent years, with the increase of coal mining depth year by year and gas disasters have become increasingly prominent. Studying the pore structure characteristics of coal samples with different gas content is of great significance to mine disaster prevention and control. Mercury intrusion porosimetry (MIP) is the main method for characterizing the pore structure of coal seams, but under high pressure, the coal matrix will undergo significant compression, which makes it difficult to accurately describe micro and small pores. This paper takes coal samples from mines in northern central Shanxi Province as the research object, and discusses the pore structure characteristics of coal samples with different gas content based on modified MIP data and fractal analysis. The results show that the compressibility coefficient of coal matrix Kc shows obvious three-stage changes with the increase of the compressibility coefficient of coal matrix _R0, max» and the modified MIP data can more accurately describe the pore structure of coal bodies. The high gas outburst coal samples are mainly semi-open micro and small pores, providing 80. 64% and 81. 23% of the pore specific surface area and volume, and the abundant specific surface area is easier for gas accumulation. Fractal dimensions of medium and large pores in coal samples D[and fractal dimensions of micro and small pores D2 gradually increased with the increase of R0, max, and D, is significantly smaller than D2, indicating that with the increase of the degree of metamorphism, the overall development of pores gradually become complex, the surface is rougher, and the internal structure of micro and small pores is relatively simple, and the pore surface is relatively smooth. The average Di and D2 of the high outburst coal samples and the low gas coal samples are 2. 26, 2. 76 and 2. 0 9, 2. 55, respectively, indicating that the porosity in each stage of the high gas outburst coal samples is more developed, and the heterogeneity is stronger. © 2023 China University of Mining and Technology. All rights reserved.
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页码：1075 / 1083
页数：8
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