Experimental Study on Influence of Gas Pressure on Coal Adsorption/Desorption Deformation Characteristics
GUO Ping
Abstract：Based on 8# coal seam of coal core samples of Yuyang Coal Mine of Songzao Coal and Power Company, the experiments of coal adsorption-desorption deformation were carried out under different gas pressures. The test result indicated that: the adsorption-desorption deformation dynamic curve of coal containing gas could be divided into vacuum compression deformation stage I, adsorption swelling deformation stage II, and desorbed shrinkage deformation stage III; the adsorption-desorption deformation of coal had obvious anisotropic characteristics. The ratios of horizontal and vertical deformation did not change significantly with time and pressure, and it tended to be constant;the volumetric deformation of coal containing gas increased linearly with the increase of adsorption/desorption pressure. At the same time, the longer the adsorption/desorption time, the greater the linear slope; the adsorption-desorption deformation was irreversible. The residual deformation increases with the gas pressure, and the vertical deformation provided more contribution to residual volume deformation.
Keywords：coal containing gasadsorption swellingdesorption shrinkageresidual deformationgas pressure
Publication Date：2019-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 13-16 )