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Mechanical Evolution Mechanism of Coal and Gas Outburst

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

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).

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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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