Influence of Gas Pressure on the Failure Mechanism of Coal-like Burst-Prone Briquette and the Subsequent Geological Dynamic Disasters
Abstract
:1. Introduction
2. Materials and Methods
2.1. Mold Design
2.2. Specimen Preparation
2.3. New Multi-Phase (Solid–Gas Coupling) Testing Facility
2.4. Testing Scheme
3. Results
3.1. The Effect of Gas on Coal Failure Modes
3.2. The Effect of Gas on Burst Proneness
3.2.1. Uniaxial Compressive Strength
3.2.2. Duration of Dynamic Fracture
3.2.3. Burst Energy Index
3.3. AE Data Analysis for Gas-Saturated Coal Specimen
4. Discussion
5. Conclusions
- (1)
- A new multi-phase (solid–gas coupling) testing facility composed of a servo control loading system with a solid–gas coupling device, a gas supply system, an acoustic emission (AE) monitoring system, and an external monitoring system has been developed. The preparation of burst-prone coal briquettes was performed for the first time. This provides an experimental basis to determine the influence of gas on the failure mode and burst proneness of specimens.
- (2)
- The gas content has a great influence on the failure mode of coal specimens. With an increase in gas pressure, the macroscopic damage pattern of coal specimens gradually changes from bursting-ejecting of large pieces to stripping–shedding of small fragments adhered to mylonitic coal.
- (3)
- The gas pressure affects the burst proneness index of coal specimens and causes the weakening and loss of the burst properties of coal specimens. The compressive strength of the coal specimen decreases with the increase in gas pressure, and the critical gas pressure for the loss of burst proneness is 0.4 MPa. The duration of dynamic fracture of coal specimens increases with the increase in gas pressure, and the critical gas pressure for the loss of burst proneness is 0.2 MPa. The burst energy index decreases with the increase in gas pressure, and the critical gas pressure for the loss of burst proneness is 0.6 MPa. The duration of dynamic fracture is more sensitive to gas pressure.
- (4)
- The ratio of the AE counts and energy after the stress peak to the accumulated AE counts and energy increases with the increase in gas pressure, which shows that the consumed energy after the stress peak increases. This eventually leads to the loss of burst proneness of the coal specimen.
- (5)
- Based on the test results, it is suggested that when identifying the burst proneness of deep, high-gas-content coal seams, it is necessary to account for the corresponding gas pressure in the environment in the relevant burst proneness tests.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Category | I | II | III | |
---|---|---|---|---|
Burst Proneness | None | Weak | Strong | |
Index | Duration of dynamic fracture | |||
Elastic strain energy index | ||||
Bursting energy index | ||||
Uniaxial compressive strength |
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Chen, Y.; Wang, Z.; Hui, Q.; Zhang, Z.; Zhang, Z.; Huo, B.; Chen, Y.; Liu, J. Influence of Gas Pressure on the Failure Mechanism of Coal-like Burst-Prone Briquette and the Subsequent Geological Dynamic Disasters. Sustainability 2023, 15, 7856. https://doi.org/10.3390/su15107856
Chen Y, Wang Z, Hui Q, Zhang Z, Zhang Z, Huo B, Chen Y, Liu J. Influence of Gas Pressure on the Failure Mechanism of Coal-like Burst-Prone Briquette and the Subsequent Geological Dynamic Disasters. Sustainability. 2023; 15(10):7856. https://doi.org/10.3390/su15107856
Chicago/Turabian StyleChen, Ying, Zhiwen Wang, Qianjia Hui, Zhaoju Zhang, Zikai Zhang, Bingjie Huo, Yang Chen, and Jinliang Liu. 2023. "Influence of Gas Pressure on the Failure Mechanism of Coal-like Burst-Prone Briquette and the Subsequent Geological Dynamic Disasters" Sustainability 15, no. 10: 7856. https://doi.org/10.3390/su15107856