王庄煤矿不同破坏类型煤体结构差异性及其对瓦斯吸附性能的研究

Study on Coal Tectonic Difference of Different Failure Mode of Wangzhuang Coal Mine and It's Gas Adsorption

为研究不同破坏类型煤体结构差异性及其对瓦斯吸附的影响,以山西沁水煤田王庄煤矿3号煤层为工程背景,测试了4种不同破坏类型煤样的瓦斯吸附性能;采用低温液氮吸附法分析了不同破坏类型煤样的孔隙结构特征,通过FHH公式计算了煤体孔隙分形维数,并针对不同变形破坏程度煤的结构差异性进行了对比分析。结果表明:不同破坏类型煤样的瓦斯吸附能力差异显著,煤样的Langmuir体积VL从24.34cm^3/g增加到36.16cm^3/g,煤体破坏程度的增加有利于瓦斯吸附;不同破坏类型煤样的孔隙结构差异显著,煤样中值孔径变化范围为13.54~28.37nm,总比表面积在0.389~0.965m^2/g之间变化,分形维数值在2.389~2.682之间变化;总体来看,随煤体破坏程度的增加,煤孔径减小,孔比表面积增加,孔隙结构趋于复杂化,煤体拥有更强的吸附能力。

In order to study coal tectonic difference under different failure mode and it’s gas adsorption,it taking the No3coal seam of Wangzhuang coal mine of Qinshui coal field in Shanxi province as background,gas adsorption of four different failure mode coal sample were measurement,the pore structure characters of different failure coal sample were analyzed by low temperature liquid nitrogen adsorption,and fractal dimension of coal mass pore was calculated by formula FHH,the structure difference of coal sample under different deformation and failure were compared The results showed that gas adsorption ability of different coal sample were significantly difference for different failure model,the Langmuir volume VL increased from24.34cm3/g to36.16cm3/g,the coal failure degree increasing was benefit for gas adsorption,pore structure significantly difference for different failure mode coal sample,the variation range of median aperture of coal sample was13.54~28.37nm,and variation range of total specific surface area was0.389~0.965m2/g,fractal dimension variation from2.389to2.682,on the whole,with coal sample failure increasing,coal aperture decreasing,and specific surface area was increasing,pore structure was more and more complicated,and the adsorption ability of coal was more and more higher