Gas seepage equations of the coal seam under the action of moisture and the stress field

  • B. LI Henan Polytechnic University
  • P. LI Zhongyuan University of Technology
  • D.H. Sun Henan Polytechnic University
  • L.L. Zhang Henan Polytechnic University
  • C.F. Wei Henan Polytechnic University
  • Y. A. Borisyuk CKC Gas Turbines Power and Engineering Research Co., Ltd

Abstract

A seepage experiment was conducted in relation to a loaded coal mass with various moisture content and workingconditions using self-developed tri-axial gas seepage equipment. A briquette sample was used as the researchobject. The change in the relationship of coal mass permeability under the combined action of moisture contentand effective stress was studied experimentally. The relational function was established between coal mass permeabilityunder this combined action and the seepage equation expressing gas migration in the coal seam. Theresearch showed the following: (1) the moisture content of coal heavily influences effective permeability, as coalmass permeability decreases in a quadratic polynomial relationship with the increase of effective stress at constantmoisture content; (2) at constant moisture content in the coal mass, coal mass permeability gradually declines ina negative exponent relationship with the increase of effective stress. Moreover, coal seam gas seepage equationsunder the combined action of moisture and stress field were put forward based on experimental results, the law ofmass conversation and Darcy’s law.

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Published
2015-12-30
How to Cite
LI, B. et al. Gas seepage equations of the coal seam under the action of moisture and the stress field. Journal of Power Technologies, [S.l.], v. 95, n. 4, p. 250--257, dec. 2015. ISSN 2083-4195. Available at: <https://papers.itc.pw.edu.pl/index.php/JPT/article/view/721>. Date accessed: 05 aug. 2021.
Section
Energy Engineering and Technology

Keywords

The rate of moisture content; Effective stress; Permeability; Gas seepage equation

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