THERMAL SCIENCE

International Scientific Journal

Yanan Gao

,

Feng Gao

,

Guanghui Dong

,

Weicheng Yan

,

Xiaojun Yang

THE MECHANICAL PROPERTIES AND FRACTAL CHARACTERISTICS OF THE COAL UNDER TEMPERATURE-GAS-CONFINING PRESSURE

ABSTRACT
Deep mining is the most important way to obtain the resource in China now. Thus, rock is the main objective that the deep mining will encounter. Meanwhile, the frequent catastrophes in deep mining such as rock burst, coal and gas bursts, roof caving, water bursts, is the most serious problem. To have a better understanding of the mechanisms of fracture and the laws of damage evolution of rock and coal under deep environment, in this paper, the micro- and meso-scale method is employed to study the behavior of coal under different temperature, confining pressure and gas pressure. Then, the significance of the effect of temperature, confining pressure, and gas pressure on mechanical parameters is analyzed by using the ANOVA method. The fractal study of coal failure pattern by employing the SEM test and fractal dimension was carried out. The fractal dimension of coal fractures was calculated by using the box-covering method. Then, the effects of all factors on the fractal dimension of coal fractures were analyzed.
KEYWORDS
temperature, gas pressure, mechanical test, SEM test fractal dimension
PAPER SUBMITTED: 2018-07-10
PAPER REVISED: 2018-08-29
PAPER ACCEPTED: 2018-12-28
PUBLISHED ONLINE: 2019-03-31
DOI REFERENCE: https://doi.org/10.2298/TSCI180610094G
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Supplement 3, PAGES [S789 - S798]
REFERENCES
  1. Xie H, Research and Consideration on Coal Deep Mining and Ultimate Mining Depth, Journal of Coal Science, 36(2012), 4
  2. Du, Y, Experimental Study on Triaxial Compression of Coal Containing Methane Under Different Confining Pressure, Safety in Coal Mines, (2014)
  3. Li X, Experimental Study of Mechanical Properties of Outburst Coal Containing Gas Under Triaxial Compression, Chinese Journal of Rock Mechanics & Engineering, 29(2010), pp. 3350-3358
  4. Meng Z, Temperature and Pressure Under Deep Conditions and their Influences On Mechanical Properties of Sandstone, Chinese Journal of Rock Mechanics & Engineering, 25(2006), 6, pp. 1177-1181
  5. Zha W, Effect of Temperature Changes On the Mechanical Properties of Coal-Serial Sandy Mudstone Under Triaxial Compression, Journal of Safety & Environment, (2014)
  6. Babadagli T, Fractal Characteristics of Rocks Fractured Under Tension, Theoretical & Applied Fracture Mechanics, 39(2003), 1, pp. 73-88
  7. Ren L, Mixed-Mode Fracture Behavior and Related Surface Topography Feature of a Typical Sandstone, Rock Mechanics & Rock Engineering, 49(2016), 8, pp. 1-17
  8. Ai T, Box-Counting Methods to Directly Estimate the Fractal Dimension of a Rock Surface, Applied Surface Science, 314(2014), 10, pp. 610-621
  9. Shi Y, Applied Mathematical Statistics, Xi'an Jiao tong University Press, 2005
  10. ISRM, Suggested Methods for Determining the Strength of Rock Materials in Triaxial Compression: Revised Version, 1983
  11. Xu J, Experimental Research On Influence of Temperature On Mechanical Properties of Coal Containing Methane, Chinese Journal of Rock Mechanics & Engineering, 30(2010), pp. 2730-2735
  12. Yin G, Experimental Investigation On Mechanical Properties of Coarse Sandstone After High Temperature Under Conventional Triaxial Compression, Chinese Journal of Rock Mechanics & Engineering, 28(2009), 3, pp. 598-604
  13. Yang Y, Test Study of Coal's Strength and Deformation Characteristics Under Triaxial Compression, Journal of China Coal Society, 31(2006), 2, pp. 150-153
  14. Li W, Research On Mechanical Characteristics and Gas Migration Law of Coal and Rock Under Mining Influence, Chongqing University, 2014
  15. Xie H, Fractal Geometry and Fracture of Rock, Acta Mechanica Sinica, 4(1988), 3, pp. 255-264
  16. Matsushita M, Fractal View Point of Fracture and Accretion, Journal of the Physical Society of Japan, 54(1985), pp. 857-865
  17. Brown SR, A Note On the Description of Surface Roughness Using Fractal Dimension, Geophysical Research Letters, 14(1987), 11, pp. 1095-1098
  18. Turcotte, D.L., Fractal and Fragmentation, Journal of Geophysical Research, 91, B2, pp. 1921-1926
  19. Power WL, Euclidean and Fractal Models for the Description of Rock Surface Roughness, Journal of Geophysical Research, 96(1991), B1, pp. 415-424
  20. Huang S, Application of Fractal Characterization and Modelling to Rock Joint Profiles, International Journal of Rock Mechanics and Mining and Science and Geomechancis Abstracts, 29(1992), 2, pp. 89-98
PDF VERSION [DOWNLOAD]
The mechanical properties and fractal characteristics of the coal under temperature-gas-confining pressure

© 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