基于岩层移动的下邻近层卸压瓦斯抽采及应用

Pressure-relief gas extraction of lower adjacent coal seam based on strata movement and its application

以淮南新庄孜矿62114工作面为工程应用背景,研究分析了近距离上保护层开采工作面的瓦斯涌出规律,并提出了瓦斯治理措施。研究结果表明,1)上保护层采动作用下,在采动影响范围内下伏煤岩体可分为底鼓裂隙带和底鼓变形带,处于底鼓裂隙带内的下被保护层有向保护层采空区运移的趋势;2)在近距离上保护层开采工作面采用Y型通风方式可解决工作面上隅角瓦斯积聚、超限问题;3)下被保护层的穿层钻孔间距设计原则上需小于等于1倍的层间距,才能保证有效杜绝被保护层卸压瓦斯涌入保护层工作面。最后对淮南新庄孜矿近距离上保护层开采工作面进行了瓦斯抽采效果分析和总结。

In this paper, taking coal face 62114 in Xinzhuangzi mine, Huainan, as the engineering example, we analyzed the gas emission laws of the coal mining in the closed distance upper protective seam, and proposed the corresponding gas control measures. The results show that, 1） Under the mining disturbance of the upper protec- tive seam, the underlying coal/rock strata can be divided into floor heave fracture zone and floor heave deforma- tion zone in the mining influence area, and the lower protected seams under the floor heave fracture zone have the migration trends to the goal of protective seam. 2） Y model ventilation can be used to solve gas accumulation and overflow in the upper comer of the face mining in the closed distance upper protective seam. 3） In principle, the spacing of penetrating boreholes in the lower protected seams should be less than or equal to 1 times of the seam spacing, which can just effectively prevent the pressure-relief gas of protected seams flowing into the working face of protective seam. Finally, the gas extraction results of coal face mining in the closed distance upper protec- tive seam of Xinzhuangzi mine were analyzed.