提高瓦斯抽排巷快速掘进的方法

介绍了张集煤矿瓦斯抽排巷施工技术、工艺及组织在提高巷道快速掘进中的作用。

浅谈回采工作面瓦斯综合治理措施的应用

通过对回采工作面采用高位钻孔、仰角钻孔、底抽钻孔、高位抽排瓦斯巷等综合治理方法的应用分析,为高瓦斯回采工作面提供了可行的综合治理方案,为解决工作面回风、上隅角瓦斯超限提供了参考。

厚煤层窄煤柱留设及支护设计研究

针对竹林山煤矿厚煤层"两进两回"系统中瓦斯抽排巷窄煤柱的留设问题,采用理论计算、数值模拟、现场监测等方法进行了研究。结果表明:窄煤柱留设宽度为8m时,巷道底鼓和窄煤柱帮偏移量最小。并研究了二次补强支护中的锚杆、锚索参数对瓦斯抽排巷变形量的影响,优化了二次支护设计,取得了很好的应用效果。

走向大倾角煤层底板穿层钻孔设计方法

矿井瓦斯治理工作中,利用底板瓦斯抽排巷施工钻孔抽采被保护层的卸压瓦斯及进行煤层预抽,可以有效降低开采区段煤层瓦斯赋存量,同时减少围面工作中巷道迎头及煤壁的瓦斯涌出。底抽巷穿层钻孔设计中如何有效控制开采块段,提高钻孔成孔率,减少钻孔工程量,在于对煤层赋存情况的具体分析,并进行针对性的设计。

Simulation of goaf heating law and the fire cooling effect during methane drainage in high level laneway

For spontaneous combustion possibilities under large flux methane drainage in the goal, dynamic permeability in combination with the Forchheimer nonlinear equation was used to solve the problem of 3D oxygen distribution, heating law in goaf and to forecast the effects of fire protection by taking the fifth section face of the No. 18 coal seam in Nanshan Coal Mine as the basis for this study. The results demonstrate that if the vertical position of the drainage laneway is so low as to cause serious air leakage, a high oxygen concentration area exists in the return side of the goaf, and there is also a high temperature region which has faster heating rate than in the other areas. The effect of methane drainage on goal heating can be alleviated dramatically by simultaneous plugging and nitrogen injection. The results show that gas data in the return side of the goaf must be detected carefully in the work face, which is of similar drainage arrangement. Therefore, comprehensive fire protection measures should be carried out if conditions permit.