论文部分内容阅读
从祁东矿岩浆侵入的形成机制入手,分析了岩浆侵入分布特征,岩浆岩侵入对煤体结构、构造煤的成因及分布、瓦斯异常赋存的影响,阐明了岩浆侵入对煤与瓦斯突出的控制作用。研究结果表明:岩浆以顺煤层上部侵入为主,改变局部煤层的顶板岩性,形成致密的隔气层;导致煤层、煤质在垂向上煤级分带异常显著,二次生烃含气量增加显著,二者控制着瓦斯异常富集赋存;构造运动伴随岩浆活动,形成构造煤和局部应力集中区,应力分析得出,中央回风下山巷道走向为近SN向,与最大主应力方向夹角大,巷道在掘进过程中煤体承受应力较大,产生构造煤,同时,构造煤特性决定其抵抗外来破坏的能力小,造成了该区域频繁发生动力现象。
Based on the formation mechanism of magmatic intrusion in Qidong Mine, the characteristics of magma intrusive distribution, the influence of magmatic rock intrusion on the structure of coal body, the genesis and distribution of tectonic coal and the abnormal occurrence of gas are analyzed. The influence of magma intrusion on coal and gas outburst Control effect. The results show that the magmas are dominated by upper coal seam intrusions, changing the roof lithology of local coal seams to form a dense gas barrier. The coal seam and coal quality are characterized by anomalous coal grade zoning in the vertical direction and increased secondary gas generation The two are controlling the accumulation of gas anomalies; the tectonic movement accompanies the magmatic activity to form tectonic coal and the local stress concentration area. The stress analysis shows that the direction of the central return wind is in the direction of near SN and close to the direction of the maximum principal stress In the tunneling process, the coal body under stress is large and tectonic coal is generated. At the same time, the tectonic coal characteristics determine its resistance to external damage is small, resulting in frequent dynamic phenomenon in the area.