屯兰矿区含瓦斯煤微结构定量表征

Quantitative Characterization of Microstructure of Gas-bearing Coal in Tunlan Mining Area

为了揭示含瓦斯煤微结构对瓦斯运移的意义,对屯兰矿区太原组含煤岩系不同埋藏深度7个煤样品进行了X射线衍射(XRD)定量表征,结合布拉格方程式,计算出煤微晶结构参数.研究结果表明,随着煤化程度增加,含瓦斯煤XRD图谱中(002)峰不对称性逐渐减弱,对应的延展长度(La)和堆砌高度(Lc)逐渐增加而层间距(d002)却减少;结合所建立的煤物质的单位体积数学模型,发现含瓦斯煤透气性系数、孔隙度与有序相体积之间具有显著的相关性,进而提出屯兰矿区深部煤层发生瓦斯突出的潜势比浅部煤层的高,因此需要加强对深部煤层瓦斯突出的预防工作.

In order to reveal the significance of gas-bearing coal to gas migration, XRD quantitative characterization was carried out on 7 coal samples with different burial depths in Taiyuan Formation of Tunlan Mining Area, and the structural parameters of coal microcrystals were calculated by combining Bragg equation. The results show that with the increase of coalification, the asymmetry of peak(002)gradually decreases, while the corresponding extension length(La)and stacking height(Lc)gradually increase while the interval between layers(d002)decreases. Combined with the mathematical model of coal per unit volume, it is found that there is a significant correlation between permeability coefficient, porosity and ordered phase volume coal. Furthermore, it is proposed that the potential of gas outburst in deep coal seam in Tunlan mining area is higher than that in shallow coal seam, so it is necessary to strengthen the prevention of gas outburst in deep coal seam.