Multiscale Pore Structure Characteristics and Crack Propagation Behavior of Coal Samples from High Gas Seam

Zhu, Jie; Shao, Tangsha; Li, Guiyou; Yang, Yuhang; Chen, Zhe; Lan, Tianxiang; Wang, Jinge; Zhao, Yuhan; Liu, Shuangqing

doi:10.3390/ma15134500

Cited by 6 publications

(4 citation statements)

References 57 publications

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“…Fractal dimension is a method used to express the irregularity and complexity of porous media [41][42][43][44]. The fractal dimension is between 2 and 3.…”

Section: Raw Coalmentioning

confidence: 99%

A Study on the Pore Structure and Fractal Characteristics of Briquettes with Different Compression Loads

Zhou

Peng

et al. 2022

Sustainability

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In order to study the effects of different compression loads on the pore characteristics of coal, taking remolded coal as the research object, the mercury intrusion method was used to determine the pore structures of the briquettes under the compression loads of 50, 70, 90 and 110 MPa, and the Menger sponge model was used to conduct fractal research on the measured parameters. The results show that the compression load has a significant effect on the pore structure parameters of the briquettes. The hysteresis loop generated by the mercury-intrusion and mercury-extrusion curves of raw coal is small, and the pore connectivity is better. After different loads are applied for briquettes, the hysteresis loop becomes larger, and the pore connectivity becomes worse. From the process of the raw coal to the briquettes loaded at 50 and 70 MPa, the pore-specific surface area reduced from 5.069 m2/g to 1.259 m2/g, the total pore volume increased from 0.0553 cm3/g to 0.1877 cm3/g, and the average pore size increased from 43.6 nm to 596.3 nm. When the compression load reached 70 MPa, the specific surface area, total pore volume, and average pore diameter of briquettes remained basically stable with the change in the compression load. The minipores and visible pores and fissures of raw coal contribute 78% of the pore volume, and the micropores and minipores contribute 99% of the specific surface area. After being pressed into briquettes, the volume of mesopores and macropores increases, the volume of visible pores and fractures decreases and the volume of minipores changes little; additionally, the pore surface area contributed by mesopores and macropores increases, and the pore surface area contributed by micropores decreases, indicating that the effect of compression load on pores of 10–100 nm is not obvious, mainly concentrated in the 100–10,000 nm region. The fractal curve of briquettes is fitted into three sections, which are defined as low-pressure sections 1 and 2 and high-pressure section 3, and the fractal dimensions are D1, D2 and D3 respectively. The fractal dimension D1 of briquettes with different compression loads is close to 2, D2 is close to 3 and D3 is greater than 3. The pore structures of briquettes have obvious fractal characteristics in the low-pressure sections 1 and 2 but do not conform to the fractal law in the high-pressure section. Furthermore, in the micropore stage of briquettes, the measured surface area and volume are both negative, indicating that the mercury intrusion method used to test the pore structure of the loaded briquette is more likely to cause the collapse of and damage to the pores in the micropore (<10 nm) stage.

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“…Fractal dimension is a method used to express the irregularity and complexity of porous media [41][42][43][44]. The fractal dimension is between 2 and 3.…”

Section: Raw Coalmentioning

confidence: 99%

A Study on the Pore Structure and Fractal Characteristics of Briquettes with Different Compression Loads

Zhou

Peng

et al. 2022

Sustainability

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“…However, due to the fact that the type of coal cannot reproduce the real fracture structure of raw coal, the experimental results are different from the actual situation. At present, scanning electron microscopy, CT scanning, MIP, nitrogen adsorption, and NMR technology − are increasingly used in the characterization of the fracture structure of coal rock. Many scholars have made important achievements in the study of coal imbibition based on the above testing techniques.…”

Section: Introductionmentioning

confidence: 99%

Study on the Evolution Law and Mechanism of Fracture Imbibition in Loaded Coal Based on Micro-CT

Yu,

Li,

Gao

et al. 2023

Energy Fuels

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“…The study revealed that in virgin gas-bearing coal seams, fractures are influenced by both rock pressure and gas pressure within the coal seam fissures. Zhu et al (2022) used mercury intrusion porosimetry and gas adsorption methods to investigate the pore structure characteristics of coal samples from highly gassy coal seams. The results indicated that during the initial stage of crack propagation, the main cracks on the coal samples extended along the direction of natural fractures.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of coal and gas outburst processes influenced by gas pressure, ground stress and coal properties

Ou,

Wang,

et al. 2023

Front. Earth Sci.

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With the continuous increase of mining depth, coal and gas outburst poses a significant threat to mining safety. Conducting research on the mechanisms of coal and gas outbursts contributes to understanding the evolutionary process of such incidents, thus enabling accurate prediction and prevention of coal and gas outbursts during mining operations. This paper has developed a comprehensive visual experimental system that is specifically tailored to simulate diverse coal body conditions, ground stress and gas pressures. By monitoring and analyzing the real-time progression of coal fissures during the outburst process, we can obtain valuable insights into the evolution and mechanisms of coal and gas outbursts. Additionally, this study introduces a method to determine the critical threshold for predicting coal and gas outbursts, and the critical gas pressure threshold for Jiulishan Coal Mine (Jiaozuo City, Henan Province, China) is established at 0.6 MPa.

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Multiscale Pore Structure Characteristics and Crack Propagation Behavior of Coal Samples from High Gas Seam

Cited by 6 publications

References 57 publications

A Study on the Pore Structure and Fractal Characteristics of Briquettes with Different Compression Loads

A Study on the Pore Structure and Fractal Characteristics of Briquettes with Different Compression Loads

Study on the Evolution Law and Mechanism of Fracture Imbibition in Loaded Coal Based on Micro-CT

Experimental study of coal and gas outburst processes influenced by gas pressure, ground stress and coal properties

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