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Rock Mechanics and Rock Engineering
Published in: Rock Mechanics and Rock Engineering 9/2023

20-06-2023 | Original Paper

Effects of Crack Properties on Coal Strength and Failure Mode: A Simulation Study

Authors: Jiaqi Song, Hongwei Wang, Cuimin Zhang, Shuaijie Chen

Published in: Rock Mechanics and Rock Engineering | Issue 9/2023

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Abstract

Coal cracks significantly impact the stability of underground coal mines, thus making it crucial to understand their properties for comprehending the mechanical properties of coal and ensuring mine stability. Natural and artificial coal samples were examined to investigate the effect of coal cracks on coal properties. Crack properties, such as volume, orientation, position, concentration, and fluctuation amplitude, were obtained via computerized tomography (CT) scans. In this study, the impact of these properties on coal strength and failure mode was examined after reconstructing the cracks in natural and artificial coal samples. Additionally, considering the impact of overly concentrated crack distribution in artificial coal, a numerical method was used to generate random cracks to further investigate the relationship between crack volume and coal strength. The results showed that, compared to crack volume and other factors, crack concentration had a significant impact on the strength of coal samples. As the crack volume increased, coal strength first rapidly decreased; when the crack volume reached approximately 5% of the coal sample volume, the coal strength would continue to decline with increasing crack volume, but the rate of decrease would significantly slow down. Crack curvature strongly influenced the relationship between crack orientation and coal strength. Therefore, the effect of crack shape should also be considered when discussing the relationship between crack orientation and coal strength.
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Metadata
Title
Effects of Crack Properties on Coal Strength and Failure Mode: A Simulation Study
Authors
Jiaqi Song
Hongwei Wang
Cuimin Zhang
Shuaijie Chen
Publication date
20-06-2023
Publisher
Springer Vienna
Published in
Rock Mechanics and Rock Engineering / Issue 9/2023
Print ISSN: 0723-2632
Electronic ISSN: 1434-453X
DOI
https://doi.org/10.1007/s00603-023-03368-2

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