Experimental Study on Response Law of Coal Body Permeability to Bedding Angle in Baode Mining Area

Abstract

In order to analyze the response law of the coal permeability to the angle of the bedding in Baode Mining Area, coal samples with different bedding angles were prepared. The QTS-2 coal rock permeation tester was used to test the permeability of coal under different confining pressures and inlet pressures. The results show that the coal body permeability in Baode Mining Area has obvious response to the bedding angle. With the increase of airflow direction and bedding angle, the permeability of coal body decreases linearly. The permeability of 0° angle differs from 90° angle coal sample by 1 to 2 orders of magnitude. With the increase of confining pressure, the permeability of coal body decreases exponentially. The permeability of coal sample reflects the difficulty of gas flow along the flow direction. In the actual gas drainage project, when the drilling is arranged parallel to the bedding, the direction of the coal gas flow is perpendicular to the bedding, and the permeability is minimal; when the drilling is arranged perpendicular to the bedding, the direction of coal gas flow is parallel to the bedding, and the permeability is maximal.

Keywords

• permeability
• bedding
• seepage difficult area
• gas drainage
• baode coal mine