School of Mechanics and Civil Engineering, China University of Mining and Technology (Bejing) Gas Research
Office, National Engineering and Technology Research Institute of Coal Mining National Key Lab of Coal Resources
and Safety Mining, China University of Mining and Technology (Bejing) Ventilation Division, Shanxi Lu'an Mining
Group Corporation Limited

为了揭示应力、气体吸附共同作用下煤岩的结构变化规律,对不同轴向载荷、不同瓦斯压力条件下的煤样进行CT扫描,基于CT图像定义了体素孔隙率α,分析了煤样体积应变、CT图像灰度及孔隙分布的变化规律。结果表明:体素孔隙率α可以反映应力、气体吸附共同作用下煤样内部不同尺度孔隙结构的变化;040%时体素区域主要起着瓦斯运移通道作用;瓦斯吸附首先发生在0

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 coaI samples under the conditions of the different axial loading and different gas pressures. Based on the CT images, the voxel porosity a was defined and the volume strai n of the coal samples, CT image grey scale and pore distribution variation law were analyzed. the results showed that the voxel porosity a could reflect the different siz e pore structure variation within the coal samples under the joint role of the stress and gas adsorption. When 0 < as 20%, the voxel region in the gas role would play a | eading role. When a > 40%, the voxel region would mainly play a role of gas migration channel. Gas adsorption would firstly occur in the 0 < a S10% voxel region and w ith the axial pressure increased, the adsorption would steadily play a role to the 10% < as20% voxel region. Compared to the gas adsorption, the stress would have a C hange role to the pore structure of the coal samples remarkably.

国家重点基础研究发展计划(973计划)资助项目(2010CB732002)；国家自然科学基金资助项目(51374211)；中央高校基本科研业务费专项资金资助项目(2010YL02)；