轴向荷载作用下煤岩吸附瓦斯特性试验研究
Study on Experiment of Coal and Rock Adsorbed Gas Speciality Under Axial Load Role
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摘要: 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0Abstract: 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.
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Keywords:
- coal and rock adsorption gas /
- gas pressure /
- CT experiment /
- voxel porosity
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