平顶山矿区东、西分区特征关键影响因素研究

Research on the different critical characteristic factors of the eastern and western areas of Pingdingshan coalmine

为研究平顶山矿区东西分区的特征,对比多种因素,分析矿区东西区的瓦斯分布特征、突出分布特征和构造煤分布规律,论述地应力和瓦斯耦合对东部矿区突出的控制作用。结果表明,东区瓦斯含量和突出强度明显高于西区,原因是其受控于东区褶皱区,地应力和瓦斯耦合控制着东区的突出;而锅底山断层的形成及其后期演化使西区突出危险性小于东区。东西地质构造的不同,不但导致构造煤、瓦斯含量分布不同,而且给地应力与瓦斯耦合提供了不同的条件。总之,东部褶皱区是造成东区与西区产生明显分区性差异的关键影响因素。

The paper attempts to bring about our investigation of the critical different characteristic factors of the eastern and western areas of Pingdingshan Coalmine in a comparative analysis approach. For our research goal, we have analyzed the distribution of the gas con- tent, the outburst characteristics and the tectonic coal in the western and eastern areas of the coal mine. In addition, we have made a dis- cussion on a critical dominant role of the stress and gas coupling that may be exerted on the outburst of the eastern areas. The results of our study have found that the gas content and the outburst scale of the eastern mining areas turns to be significantly higher than that in the western areas because of the particular fold structural features. It can thus be concluded that the stress and gas coupling can be a dominant factor leading to the outbursts of the eastern mining area. In addition, since the distribution of the outburst and tectonic coal tend to be strongly consistent, it would be possible to predict the likely-to-hap- pen risks and hazards from the investigation and interpretation of the tectonic coal seams in the deep mine. However, the Guodishan Fault can be a thrust fault and later would become a normal fault after its reversion. Since the stress is likely to get released to some extent, the original formation and later evolution of the Guodishan Fault which lies in the western areas of the mine may not account for the unex- pected outbursts in the western mining areas, rather than become the reason for the less dangerous outbursts in the western areas than in the eastern. The folded structure in the eastern .mining areas may be of another kind of factor promoting the outburst. For example, No. 10 mine and No. 1 mine are adjacent to each other, but they are signifi- cantly different in the connection of unexpected outburst accidents. Whereas No. 10 mine has to be confronted with 50 times of outbursts, there may not be any of such outbursts likely to happen with No. 1 mine. The reason for the outbursts with No. 10 mine is that it is locat- ed in the fold structure of eastern mining areas while No. 1 mine is not. The difference of tectonic structure between the western and the eastern areas may account for the difference in tectonic coals and gas contents, provided that the different conditions for the in-situ stress and gas couplings. Therefore, the structural folds in the eastern areas and the Guodingshan Fault in the westem areas must be the critical factors accounting for the contrasted features in the two mining areas of Pingdingshan Mine.