为了减缓采煤向深部开发的速度,提高资源回收率,以及在为予防瓦斯突出先行开采解放层等多方面的需要,世界各国对薄煤层的开采给予了特别的关注,发行过许多有关薄煤层的开采的专门书籍。这里介绍一种首先沿煤层钻孔,而后从钻孔前端喷射出高压水,破碎煤 In order to reduce the rate of exploitation of deep-seated coal and increase the recovery rate of resources, as well as the need to pre-empt the anti-gas outburst, various countries in the world have paid special attention to the exploitation of thin coal seams, and have issued many reports on thin coal seams The mining of specialized books. Here is a description of a first drilling along the coal seam, and then jetted from the front of the hole high-pressure water, broken coal