Analyzing the Synchronous Acoustic and Electric Response of Coal Burst Failure: Validation through the On-Site Application
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials and Specimens
2.2. Experimental Set-Up
3. Experimental Results and Analysis
3.1. Stress-Deformation Characteristics of the Uniaxial Compression Damage Process of Coal Samples
3.2. AE and EME Response of Coal Samples during Uniaxial Compression Failure
3.3. Relationship between Coal Rock Body Failure and M Value
3.4. AE and EME Synchronous Response Analysis and Early Warning R Index
4. Field Application and Validation
5. Conclusions
- (1)
- During uniaxial loading, the AE and EME signals increase significantly and appear strongly synchronized after entering strain strengthening area. With a significant reduction in the load in the strain-reinforced zone and before and after entering the damaged zone, the synchronization of the AE and EME signal is the strongest. At this stage, it can accurately reflect the coal mass entering the damage danger zone.
- (2)
- The R value, the fusion unified dimensionless index of AE and EME, can well reflect whether the coal mass entered the damage danger zone and can be regarded as one of the precursors of the imminent failure of coal and rock. When R > 1, it indicates that the specimen is about to enter or has entered the failure danger zone, and the more concentrated the R > 1 event, the greater the danger.
- (3)
- On-site verification shows that the stress distribution of the roadway has a good correspondence with the number of the R > 1 events. In areas with abnormally increased roadway stress, the number of the R > 1 events in 90 s is greater than 40. In areas with normal or reduced roadway stress, the number of the R > 1 events in 90 s is between zero and two. Compared with the index of AE or EME energy signal, the unified R value index of AE and EME fusion can better reduce the influence of interference factors and can reflect the danger of localized coal and rock dynamic disaster clearly and accurately.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Sample | Sample Number | Density/g∙cm−1 | Peak Load/kN | Elastic Modulus /GPa | Compressive Strength/MPa |
---|---|---|---|---|---|
Kuangou mine sample | K1 | 1.34 | 44.96 | 1.85 | 22.91 |
K2 | 1.33 | 42.08 | 1.81 | 21.55 | |
K3 | 1.33 | 43.58 | 1.92 | 22.34 | |
Mean value | 1.33 | 43.54 | 1.86 | 22.67 | |
Tashan mine sample | T1 | 1.27 | 72.41 | 2.89 | 24.89 |
T2 | 1.28 | 67.72 | 3.42 | 34.51 | |
T3 | 1.27 | 44.27 | 3.14 | 22.56 | |
Mean value | 1.27 | 61.5 | 3.15 | 27.32 | |
Jinjia mine sample | J1 | 1.44 | 24.98 | 1.78 | 9.24 |
J2 | 1.44 | 41.64 | 2.74 | 20.28 | |
J3 | 1.45 | 32.66 | 0.96 | 14.08 | |
Mean value | 1.44 | 33.09 | 1.82 | 14.53 |
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Zhao, Y.; Song, D.; Wei, M.; Khan, M.; Li, Z.; Qiu, L.; Yin, S. Analyzing the Synchronous Acoustic and Electric Response of Coal Burst Failure: Validation through the On-Site Application. Foundations 2022, 2, 746-762. https://doi.org/10.3390/foundations2030051
Zhao Y, Song D, Wei M, Khan M, Li Z, Qiu L, Yin S. Analyzing the Synchronous Acoustic and Electric Response of Coal Burst Failure: Validation through the On-Site Application. Foundations. 2022; 2(3):746-762. https://doi.org/10.3390/foundations2030051
Chicago/Turabian StyleZhao, Yingjie, Dazhao Song, Menghan Wei, Majid Khan, Zhenlei Li, Liming Qiu, and Shan Yin. 2022. "Analyzing the Synchronous Acoustic and Electric Response of Coal Burst Failure: Validation through the On-Site Application" Foundations 2, no. 3: 746-762. https://doi.org/10.3390/foundations2030051