CAJ | 학술논문

为了研究巨厚火成岩对下伏煤层瓦斯赋存的控制作用，以海孜煤矿10煤层火成岩不同覆盖厚度区域所取5个煤样为研究对象，测定了坚固性系数、瓦斯放散初速度、瓦斯吸附常数、突出危险性指标K值等参数随火成岩覆盖厚度的变化，同时采用工业分析、CO2测微孔、电镜扫描、显微组分分析、镜质组反射率测定等方法研究了火成岩对煤质、孔隙结构的影响。结果表明：巨厚火成岩分布对下伏煤层煤质及瓦斯赋存具有控制作用，其热演化和热变质作用提高了10煤层变质程度，10煤层由无火成岩覆盖区的长烟煤逐渐演化为巨厚火成岩覆盖下的瘦煤；随上覆火成岩厚度增加，10煤层微孔发育，吸附和储集瓦斯的能力增强，瓦斯含量增加；火成岩侵入带来的挤压作用使厚覆盖层下煤层强度降低，局部更易形成软煤分层，增加了煤与瓦斯突出危险性。
위료연구거후화성암대하복매층와사부존적공제작용，이해자매광10매층화성암불동복개후도구역소취5개매양위연구대상，측정료견고성계수、와사방산초속도、와사흡부상수、돌출위험성지표K치등삼수수화성암복개후도적변화，동시채용공업분석、CO2측미공、전경소묘、현미조분분석、경질조반사솔측정등방법연구료화성암대매질、공극결구적영향。결과표명：거후화성암분포대하복매층매질급와사부존구유공제작용，기열연화화열변질작용제고료10매층변질정도，10매층유무화성암복개구적장연매축점연화위거후화성암복개하적수매；수상복화성암후도증가，10매층미공발육，흡부화저집와사적능력증강，와사함량증가；화성암침입대래적제압작용사후복개층하매층강도강저，국부경역형성연매분층，증가료매여와사돌출위험성。
To study the controlling effect of extremely thick igneous rock on gas occurrence of under-lying coal seam, five coal samples had been selected in igneous rock covered areas with different thick-ness in No.10 Coal Seam of Haizi Coal Mine. The changes of coal firmness coefficient, initial methane diffusion velocity, methane adsorption constants, outburst risk index value, etc, as the increasing of ig-neous rock thickness were tested in this paper. Meanwhile, the proximate analyses, micro porous meas-ured by carbon dioxide, scanning electron microscopy and maceral were used to study the influence of igneous rock on the coal quality and pore structure. The results show that the distribution of extremely thick igneous rock plays a control role in the coal property and gas occurrence of underlying No.10 Coal Seam. The metamorphic degree of No.10 Coal Seam has been improved under the thermal evolution and thermal metamorphic effects of igneous rock. The underlying coal seam is gradually improved from long flame coal in without igneous rock covered area to lean coal under the extremely thick igneous rock. With the thickness increase of overlying igneous rock, the micro porous of No.10 Coal Seam developes, the ability of gas adsorption and reservoir enhances, and the gas content increases. The strength of underlying No.10 Coal Seam decreases under the squeezing action of igneous rock intrusion,coal layer can be easily formed in local area. Thus, the risk of coal and gas outburst increases.