THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

External Links

Yanan Gao

,

Weicheng Yan

,

Xiaojun Yang

CRACK CLOSURE AND INITIATION STRESSES OF COAL SUBJECTED TO THERMO-GAS-MECHANICAL COUPLING

ABSTRACT
In this paper, the orthogonal experiment method is employed to design physical tests of coal under different temperatures, confining pressures, and gas pressures. The crack closure stress and crack initiation stress are calculated using four known methods, i. e. axial strain method, axial stiffness method, crack volume method, and strain response method. The obtained results are compared, and the advantages and drawbacks for the used methods are also discussed. The influences of the three factors on the crack closure and crack initiation stresses are analyzed.
KEYWORDS
temperature, mechanical test, crack closure stress, crack initiation stress
PAPER SUBMITTED: 2017-02-10
PAPER REVISED: 2017-05-10
PAPER ACCEPTED: 2017-05-16
PUBLISHED ONLINE: 2017-12-02
DOI REFERENCE: https://doi.org/10.2298/TSCI17S1301G
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE Supplement 1, PAGES [S301 - S308]
REFERENCES
  1. Xie, H., et al., Research and Consideration on Coal Deep Mining and Ultimate Mining Depth, Journal of Coal Science, 36 (2012), 4, pp. 535-542
  2. Liu, D., et al., Study on Dynamic Monitoring of Rock Crack Propagation Process, Chinese Journal of Rock Mechanics and Engineering, 25 (2006), 3, pp. 467-472
  3. Wu, S., et al., Analysis of Effective Stresses of Coal Containing Coal Bed Methane, Chinese Journal of Rock Mechanics and Engineering, 24 (2005), 10, pp. 1674-1678
  4. Brace, W. F., et al., Dilatancy in the Fracture of Crystalline Rocks, Journal of Geophysical Research, 71 (1966), 16, pp. 3939-3953
  5. Li, P., et al., A Volumetric Strain-Based Method to Determine Crack Initiation Stress of Low-Porosity Rocks, Proceedings, 5th International Conference on Intelligent Systems Design and Engineering Applications (ISDEA), Washington, DC, USA, 2014, pp. 106-108
  6. Peng, J., et al., Crack Closure Stress and Damage Evaluation of Rock Microcrack, Journal of Rock Mechanics and Engineering, 34 (2015), 6, pp. 126-132
  7. Qiao, L., et al., Study on the Lateral Strain Response for Determining Crack Initiation in Compression Tests on Low-Porosity Rocks, (Rock Characterization, Modelling and Engineering Design Methods), Proceedings, 3rd International Society for Rock Mechanics (ISRM) Sinorock Symposium, Shanghai, China, 2013, pp. 143-148
  8. Du, Y., et al., Study on Triaxial Compression of Gas - Bearing Coal under Different Confining Pressure, Coal Mine Safety, 45 (2014), 10, pp. 10-13
  9. Li, X., et al., Experimental Study on Mechanical Properties of Ouburst Coal Containing Gas under Triaxial Compression (in Chinese), Chinese Journal of Rock Mechanics and Engineering, (2010), S1, pp. 3350-3358
  10. Ma, Z., et al., Experimental Study on the Effect of Temperature on Coal Mechanical Properties, Journal of Mining and Safety Engineering. 22 (2005), 3, pp. 46-48
  11. Shi, Y., Applied Mathematical Statistics, Xi'an Jiao Tong University Press, Xi'an, China, 2005
  12. Franklin, J. A., ISRM Suggested Methods for Determining the Strength of Rock Materials in Triaxial Compression: Revised Version, International Journal of Rock Mechanics and Mining Sciences and Geo Mechanics Abstracts, 20 (1983), 6, pp. 285-290
  13. Eberhardt, E., et al., Identifying Crack Initiation and Propagation Thresholds in Brittle Rock, Canadian Geotechnical Journal, 35 (1998), 2, pp. 222-233
  14. Martin, C. D., et al., The Progressive Fracture of Lac Du Bonnet Granite, International Journal of Rock Mechanics and Mining Sciences and Geo Mechanics Abstracts, 31 (1994), 6, pp. 643-659
  15. Nicksiar, M., et al., Evaluation of Methods for Determining Crack Initiation in Compression Tests on Low-Porosity Rocks, Rock Mechanics and Rock Engineering, 45 (2012), 4, pp. 607-617
PDF VERSION [DOWNLOAD]
Crack closure and initiation stresses of coal subjected to thermo-gas-mechanical coupling

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence