What does this research mean for the field?

Increasing coal thickness nonlinearly decreases the characteristic strengths of coal-rock combinations and shifts the dominant failure zone from coal-rock interfaces to coal interiors, resulting in higher risks of high-energy dynamic disasters. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To determine how varying coal seam thickness alters the characteristic strength, damage evolution, and failure mechanisms of coal–rock combination systems during underground mining.

August 22, 2026ProcessesOpen Access

The Characteristic Strength and Damage Temporal and Spatial Evolution of the Combination Under the Coal Thickness Effect

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Authors

BWBaochen WangHeilongjiang University of Science and Technology YDYanwei DuanHeilongjiang University of Science and Technology KRKai RenJiangsu University

Discussion

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Overview

Experimental testing demonstrates that increasing coal thickness nonlinearly reduces strength and shifts failure to coal interiors, indicating elevated dynamic disaster risks in thick seams.

Key Points

To determine how varying coal seam thickness alters the characteristic strength, damage evolution, and failure mechanisms of coal–rock combination systems during underground mining.
Conducted uniaxial compression tests on coal–rock combination specimens fabricated with different coal thicknesses.
Used acoustic emission (AE) monitoring and absolute energy data to track full-process 3D spatial damage localization and model system instability.
Uniaxial compressive strength (UCS), initiation strength, and damage strength decreased nonlinearly with increasing coal thickness, with initiation and damage strengths representing approximately 50% and 75% of UCS, respectively.
Thicker coal layers weakened the confining effect of adjacent sandstone, shifting the dominant failure zone from coal–rock interfaces directly into the coal interior.
Larger coal thicknesses exhibited distinct energy accumulation-release stages and elevated risks for high-energy dynamic disasters, supporting a stratified prevention framework of thin protection, medium pressure relief, and thick control.

Cite This Study

Wang et al. (2026) studied this question.

synapsesocial.com/papers/6a895f87ca7ade938187e2da https://doi.org/10.3390/pr14162641

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August 22, 2026ProcessesOpen Access

The Characteristic Strength and Damage Temporal and Spatial Evolution of the Combination Under the Coal Thickness Effect

View Full Paper

Ask AI

Bookmark

Authors

BWBaochen WangHeilongjiang University of Science and Technology YDYanwei DuanHeilongjiang University of Science and Technology KRKai RenJiangsu University

Discussion

Member takes

Overview

Experimental testing demonstrates that increasing coal thickness nonlinearly reduces strength and shifts failure to coal interiors, indicating elevated dynamic disaster risks in thick seams.

Key Points

To determine how varying coal seam thickness alters the characteristic strength, damage evolution, and failure mechanisms of coal–rock combination systems during underground mining.
Conducted uniaxial compression tests on coal–rock combination specimens fabricated with different coal thicknesses.
Used acoustic emission (AE) monitoring and absolute energy data to track full-process 3D spatial damage localization and model system instability.
Uniaxial compressive strength (UCS), initiation strength, and damage strength decreased nonlinearly with increasing coal thickness, with initiation and damage strengths representing approximately 50% and 75% of UCS, respectively.
Thicker coal layers weakened the confining effect of adjacent sandstone, shifting the dominant failure zone from coal–rock interfaces directly into the coal interior.
Larger coal thicknesses exhibited distinct energy accumulation-release stages and elevated risks for high-energy dynamic disasters, supporting a stratified prevention framework of thin protection, medium pressure relief, and thick control.

Cite This Study

Wang et al. (2026) studied this question.

synapsesocial.com/papers/6a895f87ca7ade938187e2da https://doi.org/10.3390/pr14162641

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