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mei ceng shui ping chang zuan kong chou fang wa si
Author(s): 
Pages: 39-44
Year: Issue:  10
Journal: Safety in Coal Mines

Keyword:  水平长钻孔抽放瓦斯煤层抽放参数预抽瓦斯暴露面积孔长度正比关系透气性能打钻;
Abstract: <正> 煤层预抽瓦斯的效果除与其自身透气性能有直接关系外,还与钻孔的表面积亦即煤体的暴露面积有关。在透气性能及有关抽放参数一定的情况下,钻孔抽出的瓦斯量与钻孔长度呈正比关系。因此,在一定的打钻能力下,尽可能地加大钻孔的长度往往可收到
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