Mathematical model of one-dimensional penetration stability failure for gaseous coal
| Autor: | Dongjia Liu, Haijian Xie, Yan Xie, Laibin Wang |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Computer simulation business.industry Coal mining Finite difference method Mechanics Dissipation Condensed Matter Physics complex mixtures Instability Physics::Geophysics Computer Science Applications Fluid dynamics Coal Geotechnical engineering business Porous medium Physics::Atmospheric and Oceanic Physics |
| Zdroj: | Progress in Computational Fluid Dynamics, An International Journal. 17:27 |
| ISSN: | 1741-5233 1468-4349 |
| Popis: | Based on the theory of fluid dynamics in porous media, combined with the gas state equation, Darcy's law and the discriminant equation of one-dimensional seepage instability, a mathematical model of one-dimensional penetration stability failure is established to study the seepage damage law of coal seam. Assuming that the background pressure of the coal wall is attenuated according to the exponential law, the mathematical equation is solved by using the finite difference method. Furthermore, the process of coal bed instability which is supposed as a form of a 'sublayer' pushing forward was analysed. That is, the coal bed loses its stability layer by layer. The calculation results showed that the thickness of the failure sublayer decreases with the reduction of coal permeability and the acceleration of dissipation rate of the background pressure. The model provides a method which can analyse the outburst process and its intensity quantitatively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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