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南桐煤田的煤层开采到一定深度后,可采层均具有煤与瓦斯突出危险。在煤系中,有一不可采的极薄煤层,煤与瓦斯突出危险较小,作为解放层开采较为安全可靠,但由于煤层薄,开采劳动条件差、用人多、出矸量大、坑木消耗高、进度慢、工效低、成本高,而且还要受邻近四号层瓦斯突然喷出的威胁。因此,开采解放层的速度远不能适应生产发展的需要。针对这一情况,我们对“钻卸法”开采极薄解放层防止突出的效果进行研究,现叙述如下:
After the mining of Nantong coalfield reaches a certain depth, the recoverable layers all have the danger of coal and gas outburst. In the coal series, there is an extremely unlikely coal seam with less danger of coal and gas outburst, which is more safe and reliable as a liberated layer. Due to the thin coal seam, poor working conditions, lots of workers, High, slow progress, low efficiency, high cost, but also by the adjacent layer 4 gas suddenly threatened. Therefore, the speed of mining the liberation far can not meet the needs of the development of production. In view of this situation, we have conducted a study on preventing the outstanding effects of the ultra-thin liberation layer of the “Drilling and Dumping Law,” as follows: