煤巷工作面突出预测钻孔动力现象演化机制及关联性探讨

发布时间：2018-07-16 19:17

【摘要】：为提高煤巷工作面突出预测的准确性,对突出预测钻孔常见的喷孔、卡钻等动力现象演化机制进行了研究。首先基于钻孔孔壁位移理论公式探讨了可能导致钻孔失稳破坏的影响因素,进而分析了导致喷孔、卡钻现象出现的原因。然后描述了喷孔现象发生的力学条件及演化过程,并分析了发生卡钻现象的可能类型,利用自主设计的一套能够模拟煤巷现场突出预测的打钻装置,在实验室利用不同煤阶的煤样,使其吸附不同压力的CO_2和N_2模拟具有不同突出危险性的煤层,并在模拟煤层中施工突出预测钻孔,对喷孔、卡钻等常见动力现象与突出危险性的联系及他们之间的关联进行了研究。结果表明在同等瓦斯压力上升梯度条件下,煤体吸附CO_2发生突出的可能性比吸附N_2大。随着煤层突出危险性程度的增加,钻屑量会发生突然的增大,同时发生喷孔、卡钻现象的频率增多。预示有突出危险性的卡钻现象往往和喷孔现象是相伴而生的,他们之间构成了联动体系,是相继触发的。
[Abstract]:In order to improve the accuracy of outburst prediction in coal roadway working face, the evolution mechanism of common dynamic phenomena such as jetting hole and drilling jam in outburst prediction drilling is studied. Based on the theoretical formula of borehole wall displacement, this paper discusses the influencing factors that may lead to the failure of borehole instability, and then analyzes the causes of the phenomenon of hole jetting and drilling jam. Then it describes the mechanical conditions and evolution process of the jetting hole phenomenon, and analyzes the possible types of drilling phenomenon, and makes use of a set of drilling device designed by ourselves to simulate the outburst prediction in coal roadway. The coal samples of different coal ranks are used in the laboratory to make them adsorb the coal seams with different pressures and different pressures to simulate the coal seams with different outburst risks, and the outburst prediction boreholes are constructed in the simulated coal beds, and the jetting holes are made. The relationship between salient risk and common dynamic phenomena, such as drilling, and their association are studied. The results show that under the condition of the same gas pressure rising gradient, the probability of outburst of coal adsorbed COs _ 2 is greater than that of adsorbing N _ (2). With the increase of dangerous degree of coal seam outburst, the amount of cuttings will suddenly increase, and the jetting hole will occur, and the frequency of drilling jam will increase. It is indicated that the phenomenon of drilling with prominent danger is often accompanied by the phenomenon of blowout, which forms a linkage system and is triggered successively.
【作者单位】：中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室;中国矿业大学安全工程学院;
【基金】：江苏省自然科学基金资助项目(BK20150195) 江苏省普通高校研究生科研创新计划资助项目(KYLX15_1431)
【分类号】：TD713.1

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