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Study on the evolution rules of coal deformation and failure characteristics caused by multiple mining disturbances
Yang Liu1, Zhenhua Ouyang2,3, Chunlei Li4
1School of Mechanics and Engineering, Liaoning Technical University, Fuxin, 123000, China.
Scientific Reports
|October 25, 2024
Summary
Multiple mining disturbances (MMD) cause coal deformation and damage. Understanding coal behavior under cyclic loading and impact helps prevent mining disasters like rock bursts.
Area of Science:
- Geotechnical Engineering
- Mining Engineering
- Rock Mechanics
Background:
- Coal mining operations are susceptible to multiple mining disturbances (MMD).
- These disturbances can lead to coal deformation, damage, and catastrophic events such as rock bursts.
- Understanding coal's response to these stresses is crucial for disaster prevention.
Purpose of the Study:
- To investigate the deformation evolution and fracture characteristics of coal under multiple mining disturbances (MMD).
- To analyze coal behavior under quasi-static cyclic loading-unloading (L-U) and dynamic axial compression.
- To provide a theoretical basis for mitigating mining-induced disasters.
Main Methods:
- Conducted quasi-static uniaxial cyclic loading-unloading (L-U) tests on large coal-like samples.
- Performed dynamic axial compression tests on damaged coal samples.
- Utilized 3D laser scanning and acoustic emission (AE) monitoring for data acquisition.
Main Results:
- Cyclic L-U loading induced 'wavy' deformation trends in coal samples.
- Maximum load was the primary factor influencing coal deformation; lower loads resulted in less deformation.
- Impact dynamic loading caused large-scale splitting failure, with compressive-shear failure occurring within internal holes.
- Lower cyclic loading correlated with reduced damage and smaller debris particles (higher fractal dimension) during impact failure.
- Cracks extended outwards from internal holes with increasing L-U cycles, load, and number of cycles, indicating more severe damage.
Conclusions:
- The study elucidates coal deformation and failure patterns under MMD.
- Reinforcing roadways and minimizing low-loading cyclic disturbances are vital practical considerations.
- Findings offer a theoretical foundation for enhancing mining disaster prevention and control strategies.
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