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Mechanical Evolution Mechanism of Coal and Gas Outburst

  • Huihui Liu
  • Baiquan Lin
  • Junhui Mou
  • Wei Yang
Technical Note
  • 229 Downloads

Introduction

Coal and gas outburst is one of the main disasters associated with deep coal mines (Chen and Cheng 2015; Zhou et al. 2017). When a coal and gas outburst occurs, large quantities of coal and gas are ejected into the space around the mining face in a few or tens of seconds (Lama and Bodziony 1998; Tang et al. 2016). They can not only damage equipment in roadways and ventilation systems, but also stifle and bury workers (Zhai et al. 2016). Moreover, they may result in more serious disasters, including coal dust and gas explosions (Zhu and Lin 2015).

Scholars have conducted many studies on coal and gas outburst from various perspectives. The former Soviet Union scholar Hudot (1966) put forward the energy hypothesis of coal and gas outburst, noting that coal and gas outburst was caused by the deformation potential of coal and the internal energy of gas. Khodot and Kogan (1979) revealed that the ground stress and gas pressure provided power for the outburst, while the coal’s...

Keywords

Coal and gas outburst Coal crushing Coal matrix block instability Coal matrix block pulverization 

List of Symbols

\({\sigma _{\text{m}}}\)

Stress of coal matrix

\({\varepsilon _{\text{m}}}\)

Volumetric strain of coal matrix

\(\varepsilon _{{\text{m}}}^{{\text{c}}}\)

Stress-induced volumetric strain of coal matrix

\(\varepsilon _{{\text{m}}}^{{\text{s}}}\)

Sorption-induced volumetric strain of coal matrix

\(\varepsilon _{{\text{b}}}^{{\text{c}}}\)

Stress-induced volumetric strain of bulk coal

\(\varepsilon _{{\text{f}}}^{{\text{c}}}\)

Stress-induced volumetric strain of fracture

\(\varepsilon _{{\text{b}}}^{{\text{s}}}\)

Sorption-induced volumetric strain of bulk coal

\({\varepsilon _{\text{L}}}\)

Langmuir volumetric strain

\({V_{\text{b}}}\)

Volume of bulk coal

\({V_{\text{m}}}\)

Volume of coal matrix

\(~{V_{\text{f}}}\)

Volume of fracture

\(\emptyset\)

Porosity

\({P_{\text{L}}}\)

Langmuir pressure

\({P_{\text{p}}}\)

Matrix pore gas pressure

\({P_{\text{f}}}\)

Fracture gas pressure

\({P_{\text{0}}}\)

Atmospheric pressure

\({P_{\text{c}}}\)

Confining pressure

\({\sigma _{ii}}\left( {i\,=\,x,y,z} \right)\)

Stress

\({\sigma _{{\text{ss}}}}\)

Sorption-induced stress

\({C_{{\text{bc}}}},~{C_{{\text{bp}}}}\)

Bulk compressibility coefficients

\({C_{{\text{fc}}}},{\text{~}}{C_{{\text{fp}}}}\)

Fracture compressibility coefficients

\({C_{\text{m}}}\)

Coal matrix compressibility coefficient

\({E_{\text{m}}}\)

Elastic modulus of coal matrix

\({\mu _{\text{m}}}\)

Poisson’s ratio of coal matrix

\(a\)

Atomic distance

\({K_{{\text{IC}}}}\)

Fracture toughness

\({C_{\text{l}}}\)

Initial length of coal pores

\(\beta\)

Constant

Notes

Acknowledgements

This work was supported by the Fundamental Research Funds for the Central Universities (2015XKMS003).

References

  1. Chen XJ, Cheng YP (2015) Influence of the injected water on gas outburst disasters in coal mine. Nat Hazards 76:1093–1109CrossRefGoogle Scholar
  2. Connell LD, Pan ZJ (2007) A theoretical model for gas adsorption-induced coal swelling. Int J Coal Geol 69:243–252CrossRefGoogle Scholar
  3. Connell LD, Lu M, Pan ZJ (2010) An analytical coal permeability model for tri-axial strain and stress conditions. Int J Coal Geol 84:103–114CrossRefGoogle Scholar
  4. Cui XJ, Bustin RM (2005) Volumetric strain associated with methane desorption and its impact on coalbed gas production from deep coal seams. Aapg Bull 89:1181–1202CrossRefGoogle Scholar
  5. Cui XJ, Bustin RM, Chikatamarla L (2007) Adsorption-induced coal swelling and stress: implications for methane production and acid gas sequestration into coal seams. J Geophys Res Sol Earth 112:B10202CrossRefGoogle Scholar
  6. Davidson RM (1995) Coalbed methane extraction. Fuel Energy Abstr 36:187Google Scholar
  7. Fan JJ, Feng RM, Wang J, Wang YP (2017) Laboratory investigation of coal deformation behavior and its influence on permeability evolution during methane displacement by CO2. Rock Mech Rock Eng 50:1–13CrossRefGoogle Scholar
  8. Guo PK (2014) Research on laminar spallation mechanism of coal and gas outburst propagation. Dissertation, China University of Mining and Technology, BeijingGoogle Scholar
  9. Harpalani S, Chen GL (1997) Influence of gas production induced volumetric strain on permeability of coal. Geotech Geol Eng 15:303–325Google Scholar
  10. Hu QT (2007) Study on the mechanical mechanism of coal and gas outburst and its application. Dissertation, China University of Mining and Technology, BeijingGoogle Scholar
  11. Hudot BB (1966) Coal and gas outburst. China Industry Press, BeijingGoogle Scholar
  12. Jaeger JC, Cook NGW (1979) Fundamentals of rock mechanics. Blackwell, LondonGoogle Scholar
  13. Jiang CL, Yu QX (1998) The spherical shell instability mechanism and prevention technology of coal and gas outburst. China University of Mining and Technology Press, XuzhouGoogle Scholar
  14. Jiang CL, Xu LH, Li XW, Tang J, Chen YJ, Tian SX, Liu HH (2015) Identification model and indicator of outburst-prone coal seams. Rock Mech Rock Eng 48:409–415CrossRefGoogle Scholar
  15. Khodot VV, Kogan GL (1979) Modeling gas bursts. Soviet Min 15:491–494CrossRefGoogle Scholar
  16. Lama RD, Bodziony J (1998) Management of outburst in underground coal mines. Int J Coal Geol 35:83–115CrossRefGoogle Scholar
  17. Landau LD, Lifshitz EM, Sykes JB, Reid WH, Dill EH (1959) Theory of elasticity. Pergamon, OxfordGoogle Scholar
  18. Laubach SE, Marrett RA, Olson JE, Scott AR (1998) Characteristics and origins of coal cleat: a review. Int J Coal Geol 35:175–207CrossRefGoogle Scholar
  19. Liu HH, Rutqvist J, Oldenburg CM (2010) A new coal-permeability model: internal swelling stress and fracture–matrix interaction. Transp Porous Media 82:157–171CrossRefGoogle Scholar
  20. Paterson L (1986) A model for outburst in coal. Int J Rock Mech Min 23:327–332CrossRefGoogle Scholar
  21. Rossmanith HP (1983) Rock fracture mechanics. Springer, ViennaCrossRefGoogle Scholar
  22. Tang J, Jiang CL, Chen YJ, Li XW, Wang GD, Yang DD (2016) Line prediction technology for forecasting coal and gas outbursts during coal roadway tunneling. J Nat Gas Sci Eng 34:412–418CrossRefGoogle Scholar
  23. Zhai C, Xiang XW, Xu JZ, Wu SL (2016) The characteristics and main influencing factors affecting coal and gas outbursts in Chinese Pingdingshan mining region. Nat Hazards 82:507–530CrossRefGoogle Scholar
  24. Zhao W, Cheng YP, Guo PK, Jin K, Tu QY, Wang HF (2017) An analysis of the gas–solid plug flow formation: new insights into the coal failure process during coal and gas outbursts. Powder Technol 305:39–47CrossRefGoogle Scholar
  25. Zhou SN, He XQ (1990) Rheological hypothesis of coal and methane outburst mechanism. J China Univ Min Technol 19:1–8Google Scholar
  26. Zhou AT, Wang K, Li L, Wang C (2017) A roadway driving technique for preventing coal and gas outbursts in deep coal mines. Environ Earth Sci 76:236CrossRefGoogle Scholar
  27. Zhu CJ, Lin BQ (2015) Effect of igneous intrusions and normal faults on coalbed methane storage and migration in coal seams near the outcrop. Nat Hazards 77:1–22CrossRefGoogle Scholar
  28. Zimmerman RW, Somerton WH, King MS (2012) Compressibility of porous rocks. J Geophys Res Sol Earth 91:12765–12777CrossRefGoogle Scholar

Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  • Huihui Liu
    • 1
    • 2
  • Baiquan Lin
    • 1
    • 2
  • Junhui Mou
    • 3
  • Wei Yang
    • 1
    • 2
  1. 1.Key Laboratory of Coal Methane and Fire Control, Ministry of EducationChina University of Mining and TechnologyXuzhouChina
  2. 2.School of Safety EngineeringChina University of Mining and TechnologyXuzhouChina
  3. 3.State Key Laboratory of Coal Mine Disaster Dynamics and ControlChongqing UniversityChongqingChina

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