煤吸附瓦斯气体的变形特征分析

he characteristics of coal deformation induced by methane adsorption are related to the danger of coal and gas outburst. It is found that coal methane adsorption led to coal swelling, and coal adsorption deformation appeared as anisotropy by analyzing the experimental data of coal adsorption strain of 17 mines including Yaoqiao Mine in Datun, Xieyi Mine in Huainan, Zhongma Mine in Jiaozuo, Beitouju Mine in Yangquan, Shaqu Mine in Lvliang, Xinzhouyao Mine in Datong and Datong No.1 Mine in Chongqing. Coal adsorption strains are affected by the risk of coal outburst, metamorphic grade and gas pressure. Coal samples of high outburst risk and metamorphic grade presented bigger adsorption strains under the same gas pressure. The Langmuir equation can embody the variation tendency of coal adsorption strains under different gas pressures. The fitting results showed that it is reasonable to consider coal adsorption strain as one of indexes to assess coal and gas outburst.