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Analysis on the Length of Gas Pressure Measurement Bore in Front of Tunneling Place
Author(s): 
Pages: 86-88
Year: Issue:  3
Journal: Safety in Coal Mines

Abstract: 采用胶囊-密闭液封孔测定煤层瓦斯压力时,如果钻孔深度偏短,则测定结果不是原始煤层瓦斯压力;反之,瓦斯压力测定仪可能拔不出来,导致仪器损坏.首先分析了掘进头前方煤体应力及透气性系数分布规律,并提出了透气性系数的分段函数表达式;根据达西渗透定律,推导出了掘进头前方瓦斯稳态流动时的压力分段函数表达式;最后,根据瓦斯压力的边界务件和连续条件推导出了测压钻孔深度计算公式.结果表明,掘进头前方测压钻孔深度约为...
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