Deformation, Permeability and Acoustic Emission Characteristics of Coal Masses under Mining-Induced Stress Paths
Abstract
:1. Introduction
2. Experimental Setup
2.1. Evolution Laws of Mining-Induced Stress under Three Mining Paths
2.2. Specimen Preparation and Testing Equipment
2.3. Test Scheme
2.4. Test Procedure
3. Test Result Analysis
3.1. Influence of Mining-Induced Stress Paths on the Geomechanical Characteristic of Coal Specimen
3.2. Influence of Mining-Induced Stress Paths on the Energy Densities and Permeability of Coal Samples
3.3. Influence of Mining-Induced Stress Paths on the AE Signal of Coal Samples
3.4. Influence of Mining-Induced Stress Paths on the Fractal Dimension of Coal Samples
4. Conclusions
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Sample No. | Length (mm) | Density (g/cm3) | Peak Deviatoric Stress (MPa) | Peak Stress Point | Mining Method | ||||
---|---|---|---|---|---|---|---|---|---|
σ3 (MPa) | ε1 (%) | ε3 (%) | εv (%) | Permeability (10−18m2) | |||||
C-1 | 99.1 | 1.35 | 39.39 | 6.47 | 1.46 | −0.4 | 0.66 | 0.28 | NM |
C-2 | 100.3 | 1.42 | 31.32 | 6.05 | 1.28 | −0.44 | 0.4 | 0.3 | TCM |
C-3 | 100.8 | 1.42 | 24.81 | 5.73 | 1.17 | −0.26 | 0.65 | 0.19 | PCM |
C-4 | 101.3 | 1.41 | 38.63 | 6.63 | 0.5 | −0.18 | 0.14 | 0.36 | NM |
C-5 | 100.3 | 1.42 | 29.21 | 6.15 | 0.43 | −0.2 | 0.03 | 0.33 | TCM |
C-6 | 100.4 | 1.36 | 22.34 | 5.93 | 0.44 | −0.2 | 0.04 | 0.21 | PCM |
Sample | Peak Stress (MPa) | Confining Pressure (MPa) | Size (mm) | Mass (g) | Fractal Dimension D |
---|---|---|---|---|---|
C-1 | 45.86 | 6.47 | >15 | 215.4 | 2.178 |
— | — | — | 10–15 | 9.2 | — |
5–10 | 9.1 | ||||
2–5 | 7.8 | ||||
<2 | 19.5 | ||||
C-2 | 37.37 | 6.05 | >15 | 233.2 | 2.341 |
— | — | — | 10–15 | 10.7 | — |
5–10 | 9.1 | ||||
2–5 | 6.3 | ||||
<2 | 8.2 | ||||
C-3 | 30.54 | 5.73 | >15 | 244.2 | 2.409 |
— | — | — | 10–15 | 7.2 | — |
5–10 | 6.7 | ||||
2–5 | 7.1 | ||||
<2 | 4.9 | ||||
C-4 | 45.26 | 6.63 | >15 | 177.7 | 2.172 |
— | — | — | 10–15 | 33.1 | — |
5–10 | 23.6 | ||||
2–5 | 10.8 | ||||
<2 | 13.1 | ||||
C-5 | 35.36 | 6.15 | >15 | 229.6 | 2.296 |
— | — | — | 10–15 | 9.5 | — |
5–10 | 15.5 | ||||
2–5 | 9.6 | ||||
<2 | 8.4 | ||||
C-6 | 28.27 | 5.93 | >15 | 239.5 | 2.371 |
— | — | — | 10–15 | 16.9 | — |
5–10 | 8.9 | ||||
2–5 | 5.9 | ||||
<2 | 6.7 |
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Xue, Y.; Dang, F.; Cao, Z.; Du, F.; Ren, J.; Chang, X.; Gao, F. Deformation, Permeability and Acoustic Emission Characteristics of Coal Masses under Mining-Induced Stress Paths. Energies 2018, 11, 2233. https://doi.org/10.3390/en11092233
Xue Y, Dang F, Cao Z, Du F, Ren J, Chang X, Gao F. Deformation, Permeability and Acoustic Emission Characteristics of Coal Masses under Mining-Induced Stress Paths. Energies. 2018; 11(9):2233. https://doi.org/10.3390/en11092233
Chicago/Turabian StyleXue, Yi, Faning Dang, Zhengzheng Cao, Feng Du, Jie Ren, Xu Chang, and Feng Gao. 2018. "Deformation, Permeability and Acoustic Emission Characteristics of Coal Masses under Mining-Induced Stress Paths" Energies 11, no. 9: 2233. https://doi.org/10.3390/en11092233