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Damage and deformation control equation for gas-bearing coal and its numerical calculation method.

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Title: Damage and deformation control equation for gas-bearing coal and its numerical calculation method.
Authors: Hu, Shaobin1, Wang, Enyuan2 weycumt@163.com, Kong, Xiangguo2
Source: Journal of Natural Gas Science & Engineering. Jul2015, Vol. 25, p166-179. 14p.
Subjects: Gas absorption & adsorption, Continuum damage mechanics, Gas engineering, Numerical calculations, Mining engineering
Abstract: The dual pore structure of coal and occurrence of gas adsorption make gas-bearing coal mechanical properties different from other non-adsorptive porous materials. Considering adsorbed-gas-induced swelling stress and erosion, and pore/fracture-induced damage and failure to coal skeleton, the new effective stress equation, damage deformation control equation and constitutive model for gas-bearing coal is established. Based on principle of statistics and fractal theory, we combined the macro- and micro-structure characteristics of coal, and established the control equation of fracture field distribution. According to fracture mechanics and mesoscopic damage mechanics, we also established the expansion and damage evolution control equation of mesoscopic cracks. Furthermore, we revealed the relationship between meso-scale crack extension damage and macro mechanical characteristics, set up the macro-mesoscopic numerical model and calculation method of fractured rock mechanic constitutive, and developed the stress–strain numerical calculation program of gas-bearing coal using Comsol Multiphysics partial differential equation module and MatLab software. The model and methods were further validated in field tests. The results showed that our equations could better describe the deformation and damage process of gas-bearing coal and solve the fluid–solid coupling problems in gas and coal engineering practices. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Natural Gas Science & Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 103407868
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Damage and deformation control equation for gas-bearing coal and its numerical calculation method.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Natural+Gas+Science+%26+Engineering%22">Journal of Natural Gas Science & Engineering</searchLink>. Jul2015, Vol. 25, p166-179. 14p.
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  Data: <searchLink fieldCode="DE" term="%22Gas+absorption+%26+adsorption%22">Gas absorption & adsorption</searchLink><br /><searchLink fieldCode="DE" term="%22Continuum+damage+mechanics%22">Continuum damage mechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+engineering%22">Gas engineering</searchLink><br /><searchLink fieldCode="DE" term="%22Numerical+calculations%22">Numerical calculations</searchLink><br /><searchLink fieldCode="DE" term="%22Mining+engineering%22">Mining engineering</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The dual pore structure of coal and occurrence of gas adsorption make gas-bearing coal mechanical properties different from other non-adsorptive porous materials. Considering adsorbed-gas-induced swelling stress and erosion, and pore/fracture-induced damage and failure to coal skeleton, the new effective stress equation, damage deformation control equation and constitutive model for gas-bearing coal is established. Based on principle of statistics and fractal theory, we combined the macro- and micro-structure characteristics of coal, and established the control equation of fracture field distribution. According to fracture mechanics and mesoscopic damage mechanics, we also established the expansion and damage evolution control equation of mesoscopic cracks. Furthermore, we revealed the relationship between meso-scale crack extension damage and macro mechanical characteristics, set up the macro-mesoscopic numerical model and calculation method of fractured rock mechanic constitutive, and developed the stress–strain numerical calculation program of gas-bearing coal using Comsol Multiphysics partial differential equation module and MatLab software. The model and methods were further validated in field tests. The results showed that our equations could better describe the deformation and damage process of gas-bearing coal and solve the fluid–solid coupling problems in gas and coal engineering practices. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Natural Gas Science & Engineering is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.jngse.2015.04.039
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      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 14
        StartPage: 166
    Subjects:
      – SubjectFull: Gas absorption & adsorption
        Type: general
      – SubjectFull: Continuum damage mechanics
        Type: general
      – SubjectFull: Gas engineering
        Type: general
      – SubjectFull: Numerical calculations
        Type: general
      – SubjectFull: Mining engineering
        Type: general
    Titles:
      – TitleFull: Damage and deformation control equation for gas-bearing coal and its numerical calculation method.
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            NameFull: Hu, Shaobin
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            NameFull: Wang, Enyuan
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            NameFull: Kong, Xiangguo
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          Dates:
            – D: 01
              M: 07
              Text: Jul2015
              Type: published
              Y: 2015
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              Value: 25
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