西南地区构造煤吸附解吸特性研究
Study on Gas Adsorption and Desorption Characteristics of Tectonic Coal in Southwest China
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摘要: 在系统采集西南地区典型矿井构造煤样的基础上，通过等温吸附解吸实验，探讨了不同变质变形条件下构造煤瓦斯特性。中高变质作用阶段，变质程度对瓦斯吸附的影响作用大于变形强度，无论变形强弱，低变质煤的吸附量均低于中高变质煤；在低阶煤阶段，影响甲烷吸附量的主控因素则为构造煤变形强度。解吸较好的样品主要为高变质或高变形构造煤，瓦斯解吸量和解吸应力敏感性符合文特式。瓦斯解吸初期应力敏感性强弱为：高变质弱变形煤>中变质煤及高变质强变形煤>低变质煤。Abstract: Based on acquisition of tectonic coal in typical mine of Southwest China, the gas characteristics was investigated from different metamorphism and deformation cenditions. The influence of metamorphic grade on gas adsorption is larger than that of deformation intensity in middle-high metamorphism stage. The gas adsorption of low metamorphic coal is lower than that of middle-high metamorphism coal regardless of the deformation. Main factor affecting the amount of methane adsorption is tectonic coal deformation strength in low metamorphism stage. Better desorption samples are mainly high rank coal or high deformation tectonic coal. Gas desorption and desorption stress sensitivity is in line with Covent style. The stress sensitivity of gas desorption at initial stage is that high metamorphic and weak deformation coal> middle-high metamorphic and strong deformation coal> low metamorphic coal.
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Keywords:
- Southwest China /
- tectonic coal /
- gas adsorption /
- gas desorption /
- gas occurrence
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