Effect of Dry-wet Circulation on Permeability of Coal Containing Gas
WANG Qian
LU Mingyue
WANG Weizhong
Abstract：In order to study the effect of dry-wet circulation on permeability of coal containing gas, by using the self-developed coal containing gas thermal-hydrological-mechanical ( THM) coupling experimental equipment, an experimental study about the permeability of raw coal was made under different dry-wet cycles and different average effective stresses. The research results showed that: under the condition of a constant temperature and dry-wet cycles, with the increase of average effective stress, the permeability of coal samples showed a logarithmic function decreas. The sensitivity coefficient of average effective stress to permeability increased with the increase of coal sample dry-wet cycles, decreased with the increase of average effective stress. Under the condition of a constant temperature and an average effective stress, the permeability of coal samples increased with the increase of coal sample dry-wet cycles, and the relationship between coal sample permeability and dry-wet cycle can be expressed by linear function. The more dry-wet cycles, the stronger the water absorption of the coal sample, the greater the saturation moisture content.
Keywords：raw coaldry-wet cycleaverage effective stresspermeabilitywater absorption
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 20-23,28 )