Study on Experiment of Coal and Rock Adsorbed Gas Speciality Under Axial Load Role
HAO Nai
TU Hui
MAO Lingtao
LI Min
Abstract：In order to reveal the coal and rock structure variation law under the joint role of the stress and gas adsorption,a CT scanning was conducted on the coal samples under the conditions of the different axial loading and different gas pressures.Based on the CT images, the voxel porosityαwas defined and the volume strain of the coal samples,CT image grey scale and pore distribution variation law were analyzed.the results showed that the voxel porosityαcould reflect the different size pore structure variation within the coal samples under the joint role of the stress and gas adsorption.When 0<α≤20%,the voxel region in the gas role would play a leading role.Whenα>40%,the voxel region would mainly play a role of gas migration channel.Gas adsorption would firstly occur in the 0<α≤10% voxel region and with the axial pressure increased,the adsorption would steadily play a role to the 10%<α≤20% voxel region.Compared to the gas adsorption, the stress would have a change role to the pore structure of the coal samples remarkably.
Keywords：coal and rock adsorption gasgas pressureCT experimentvoxel porosity
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 41-44,47 )