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一、前言 为了防止采煤时的瓦斯突出等灾害,应在采掘前打抽放岩层瓦斯的钻孔。如果能够通过测定瓦斯抽放孔内瓦斯喷出地点及喷出量等来予测煤层的裂缝和瓦斯的分布状态,则能打出效果更好的瓦斯抽放孔。即能根据煤层的裂缝和瓦斯的分布状态等合理地确定钻孔的深度、方向和间隔等,因此能够提高瓦斯抽放效果。 以前没有什么方法能准确地测定这种孔内瓦斯喷出量,只有通过热线式风速计测定瓦斯量,或用乙烯树脂袋测定喷出量等。但
I. Preface In order to prevent gas outburst and other disasters during coal mining, drilling of rock gas should be conducted before excavation. If we can measure the distribution of gas and coal seam cracks and gas distribution by measuring the location and amount of gas emitted in the gas drainage holes, we can make better gas drainage holes. That is to say, the depth, direction and spacing of drilling holes can be reasonably determined according to the distribution of cracks and gas in the coal seam. Therefore, the gas drainage effect can be improved. There was no previous method for accurately measuring the amount of gas emitted from such holes, only the amount of gas measured by a hot wire anemometer or the amount of discharge measured with a vinyl bag. but