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Updated: Jan 10, 2026
10:27
A Uniaxial Compression Experiment with CO2-Bearing Coal Using a Visualized and Constant-Volume Gas-Solid Coupling Test System
Published on: June 12, 2019
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Study on the Energy Evolution Mechanism and Fractal Characteristics of Coal Failure under Dynamic Loading
Haixiao Lin1,2, Wenying Zhang1,2, Shuaifang Guo1
1School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
ACS Omega
|November 24, 2025
Summary
Investigating coal failure under dynamic loading reveals strain rate dependence. Higher strain rates increase coal strength and energy consumption, leading to intensified fragmentation and aiding mine disaster prevention.
Area of Science:
- Geotechnical Engineering
- Rock Mechanics
- Materials Science
Background:
- Mining disturbances cause significant damage to coal-rock masses.
- Understanding coal deformation under dynamic loading is crucial for mine safety.
Purpose of the Study:
- To investigate the energy evolution mechanism and fractal characteristics of coal failure under dynamic loading.
- To reveal the strain rate dependence of coal's dynamic mechanical properties.
Main Methods:
- Split Hopkinson Pressure Bar (SHPB) impact tests were used to simulate dynamic loading conditions.
- Analysis of energy evolution, crack development stages, and fractal dimensions of fragmented coal.
Main Results:
- Coal deformation shows strong strain rate dependence; dynamic strength and energy consumption increase linearly with strain rate.
- Energy evolution progresses through four stages: no damage, microcrack initiation, macroscopic nucleation, and collapse.
- Fractal dimension correlates positively with strain rate and fragmentation energy density, indicating enhanced self-similarity and impact resistance at higher rates.
Conclusions:
- Increased strain rate enhances coal's impact resistance and dynamic strength through elevated elastic energy density.
- High energy consumption leads to intensified fragmentation and smaller particle sizes.
- Findings provide theoretical support for preventing and controlling mine dynamic disasters.
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