【摘要】 为研究构造煤孔隙结构对瓦斯解吸特性及钻屑解吸指标的影响,在平煤十矿己₁₅煤层选取2组构造煤样开展工业分析、孔隙结构测试及瓦斯解吸特性的研究。结果表明:构造煤样普遍呈现出松软特性,且煤样间具有相似的瓦斯吸附能力。PMR1和PMR2煤样的微孔孔容分别为0.041和0.042 cm³/g,介孔孔容分别为0.001 13和0.002 02 cm³/g,大孔孔容分别为0.004 98和0.008 31 cm³/g。PMR2煤样的初始瓦斯解吸能力高于PMR1,瓦斯解吸初期的规律具有明显的分段性质,依次为快速解吸阶段、缓慢解吸阶段和平稳解吸阶段。煤样第1 min的解吸量占解吸总量的比重为13.4%～30.9%,前10 min的累计解吸量占解吸总量的比重为40.8%～61.0%,PMR2煤样快速的瓦斯解吸能力得益于其更发育的介孔和大孔孔隙结构。煤样钻屑瓦斯解吸指标K₁和Δh₂值的可靠性分析结果表明,PMR2煤样K₁值的可靠性低于Δh₂值,原因在于PMR2煤样具有更为发育的介孔和大孔孔隙结构以及快速的初始瓦斯解吸能力,进而增加了实验误差;综合研究表明,平煤十矿己₁₅煤层煤样Δh₂的可靠性要高于K₁。更多还原

【Abstract】 In order to study scientifically the influence of pore structure of tectonic coal on gas desorption and gas desorption index of drilling cuttings,two groups of coal samples obtained from No.15 coal seam of Pingmei No.10 coal mine were selected for industrial analysis and determination of basic physical parameters such as firmness coefficient and gas desorption characteristics.The experimental results show that the tectonic coals are generally soft,and the coal samples have similar gas adsorption capacity.Micropore volumes of PMR1 and PMR2 are 0.041 and 0.042 cm³/g,respectively;mesopore volumes are 0.001 13 and 0.002 02 cm³/g;macropore volumes are 0.004 98 and 0.008 31 cm³/g.There is a higher initial gas desorption capacity for PMR2 than that of PMR1.In the early stage of gas desorption,the rule takes on obvious segmental property,which successively includes rapid desorption stage,slow desorption stage and steady desorption stage.The desorption volume of coal samples in the first minute accounts for 13.4%～30.9% of the total desorption volume,and the cumulative desorption volume in the first 10 minutes for 40.8%～61.0% of the total desorption amount.The rapid gas desorption ability of PMR2 is attributed to its more developed pore structure.The reliability analysis results show that the reliability of K₁ values of PMR2 is lower than that of Δh₂ value because of its more developed pore structure and initial gas desorption capacity,which increases the error in the experimental process.The reliability of Δh₂ is higher than that of K₁.更多还原