钻孔初始瓦斯流量规律研究

发布时间：2018-02-25 06:25

本文关键词： 钻孔初始瓦斯涌出量解吸规律瓦斯压力动态涌出突出危险性　出处：《煤矿安全》2016年05期 　论文类型：期刊论文

【摘要】：为获得钻孔初始瓦斯流量解吸规律,理论分析发现,钻孔初始瓦斯流量与钻孔半径、钻进深度、钻进时间、地应力、煤体强度和瓦斯压力有关。运用自行研制的钻孔初始瓦斯流量实验室测定装置,采集5组有代表的煤样,固定其他5个变量,在不同瓦斯压力下进行50次测定试验(其中48组数据有效)。研究表明:单位长度钻孔中涌出的钻孔初始瓦斯流量之和,即钻孔初始瓦斯涌出量与瓦斯压力近似成正比关系,瓦斯压力越高,钻孔初始瓦斯涌出量越大。对同一煤样,在气体压力相同条件下,充入CO_2时打钻测得的钻孔初始瓦斯涌出量远比充入N2时大的多。钻孔初始瓦斯涌出量的变化能较好的体现煤层突出危险性的变化。
[Abstract]:In order to obtain the desorption law of borehole initial gas discharge, it is found by theoretical analysis that the borehole initial gas discharge and borehole radius, drilling depth, drilling time and in-situ stress, The strength of coal body is related to gas pressure. By using the self-developed laboratory apparatus for measuring the initial gas flow of boreholes, five groups of representative coal samples are collected and the other five variables are fixed. Fifty tests were carried out under different gas pressures (among which 48 sets of data were valid). The results show that the sum of the initial gas discharge of boreholes emitted from boreholes per unit length is approximately proportional to the initial gas pressure of the boreholes. The higher the gas pressure, the greater the initial gas emission from borehole. For the same coal sample, under the same gas pressure, The initial gas emission of borehole drilled with CO_2 is much larger than that of N _ 2. The change of initial gas emission of borehole can well reflect the change of coal seam outburst risk.
【作者单位】：中国矿业大学安全工程学院;太原理工大学采矿工艺研究所;
【基金】：江苏省自然科学基金资助项目(BK20150180,BK20150195,BK20150181)
【分类号】：TD712

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