近距离保护层开采瓦斯运移规律

Gas migration law of coal mining in seam with short distance to protection seam

为了防止在近距离上保护层开采过程中,大量被保护层瓦斯涌入保护层,对近距离保护层开采后瓦斯分布规律及瓦斯运移规律进行了研究,研究发现,近距离保护层开采使被保护层充分卸压,可有效消突;保护层开采工作面瓦斯涌出总量的85%以上来自被保护层的卸压、解吸瓦斯,且主要汇集于上隅角及其附近一定空间范围内,并不断溢出。当其绝对量超过20 m^3/min时,必须采取综合治理手段才能实现安全高效生产。

In order to prevent mass gas in the protected seam rushing into the protective seam during the coal mining operation in the upper protective seam with a short distance, a research was done on the law of gas distribution and gas migration after coal mining operations in the protective seam with a short distance to the next seam. The research results showed that the coal mining operations in the protective seam with a short distance to the next seam could let the protected seam fully release the pressure and effectively eliminate the outburst. There were over 85% of the total gas emission in the coal mining face of the protective seam coming from the pressure releasing and desorption gas of the protected seam. The gas were mainly accumulated at the upper corner and the adjacent certain space area and were continuously discharged. When the absolute value of the gas content over the limits of 20 m^3/min, the comprehensive gas control measures should be taken to ensure safety and high efficient production.