›› 2009, Vol. 30 ›› Issue (9): 2837-2842.

• Numerical Analysis • Previous Articles     Next Articles

Seepage-stress elastoplastic coupling model of heterogeneous coal and numerical simulation

ZHANG Chun-hui1, YU Yong-jiang2, ZHAO Quan-sheng1   

  1. 1. School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China; 2. Department of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China
  • Received:2008-11-25 Online:2009-09-10 Published:2010-03-24

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Abstract:

Weibull distribution is adopted to simulate the heterogeneity of Young’s modulus and strength of coal; and the seepage-stress elastoplastic coupling mathematical model of heterogeneous coal is presented based on elastoplastic theory of coal rock and the gas flow theory. Then the finite element discretized equation of the model is obtained; and the code (coupling analysis) is developed. In a case study, the gas flow process for a gas production well in Liaoning is analyzed with the model; and some conclusions are obtained. During the gas production well works, the change of the effective stress of coal causes coal plastic failure. In plastic failure region the permeability increases by 4.9 times than initial one; while the permeability in elastic region reduces to 22% because of effective stress increasing. The gas pressure, effective stress and deformation of coal in the case study all are asymmetrical, yet obey theoretical laws. It is proved that the Weibull distribution can simulate the heterogeneity of coal.

Key words: Weibull distribution, heterogeneous coal, seepage-stress elastoplastic coupling model, FEM

CLC Number: 

  • TU 443
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