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为探讨混煤吸附瓦斯膨胀变形与瓦斯涌出之间关系,选取典型煤与瓦斯突出矿井的原生质煤及构造煤,制作混合煤样,测定不同质量比混合煤体等温吸附特性及其吸附前后比表面积。结果表明,比表面积及吸附量在混合煤样质量比为1:1时均达到最大;混合煤样吸附前后中小孔比表面积占比之差,呈先减小后增大的变化趋势;吸附前后微孔比表面积变化与中小孔变化规律相反;根据试验结果,建立了混合煤样吸附瓦斯前后比表面积变化与孔隙膨胀应力应变之间关系的数学模型,得出混合煤样吸附前后孔隙结构变化与瓦斯涌出之间的关系。
In order to explore the relationship between gas expansion and deformation due to mixed coal and the relation between the gas emission and the typical coal and the gas outburst of the original coal and tectonic coal, make the mixed coal sample, determine the isothermal adsorption characteristics and the ratio of adsorption before and after adsorption Surface area. The results showed that the specific surface area and the adsorption capacity reached the maximum when the mass ratio of mixed coal sample was 1: 1. The difference of the specific surface area of small and medium holes before and after the mixed coal samples decreased firstly and then increased, According to the experimental results, the mathematical model of the relationship between the change of specific surface area before and after adsorption of mixed coal samples and the stress and strain of pore expansion was established, and the pore structure before and after the adsorption of mixed coal samples The relationship between changes and gas emission.