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Mechanical Evolution Mechanism of Coal and Gas Outburst

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Abbreviations

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

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

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Acknowledgements

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

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Authors and Affiliations

  1. Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China

    Huihui Liu, Baiquan Lin & Wei Yang

  2. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China

    Huihui Liu, Baiquan Lin & Wei Yang

  3. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China

    Junhui Mou

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  1. Huihui Liu
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  2. Baiquan Lin
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Correspondence to Baiquan Lin.

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Liu, H., Lin, B., Mou, J. et al. Mechanical Evolution Mechanism of Coal and Gas Outburst. Rock Mech Rock Eng 52, 1591–1597 (2019). https://doi.org/10.1007/s00603-018-1546-6

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