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  

Mechanism of dynamic phenomena of borehole for outburst prediction and their relationship during coal roadway driving

作　　者：王超杰[1,2] 杨胜强[1,2] 蒋承林[1,2] 杨丁丁[1,2] 李晓伟[1,2] WANG Chaojie;YANG Shengqiang;JIANG Chenglin;YANG Dingding;LI Xiaowei(Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining ＆ Technology,Xuzhou 221116, China;School of Safety Engineering, China University of Mining ＆ Technology,Xuzhou 221116, China)

机构地区：[1]中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室,江苏徐州221116 [2]中国矿业大学安全工程学院,江苏徐州221116

出　　处：《煤炭学报》2017年第9期2327-2336,共10页Journal of China Coal Society

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)

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。To improve the accuracy of the outburst prediction in working faces of coal roadways,the evolution mechanism of the dynamic phenomena such as gas and coal being ejected from the borehole（ GCEB） and drill pipe being stuck by coal mass in the borehole（ DPSC）） were studied. Firstly,based on the theoretical formula of borehole wall displacement,the factors that affect the instability failure of borehole and the causes of occurrence for the GCEB and DPSC were discussed.Then the mechanical conditions and evolutionary process for the occurrence of GCEB were described,while the possible types of DPSC were analyzed. A self-designed drilling device that can simulate the in-situ outburst prediction of coal roadways was used in this study. The coal samples with different coal ranks to adsorb CO_2 and N_2 with different pressures in the laboratory were used to simulate the coal seams with different outburst risks. In addition,the boreholes for predicting the outburst were drilled in the simulated coal seams to study the correlation be-tween common dynamic phenomena and outburst risks.The results show that under the same rising gradient of gas pressures,the occurrence possibility of outburst caused by coal masses adsorbing CO_2 is larger than that of adsorbing N_2.When the coal seams without outburst risks change into ones with outburst risks,drilling cutting weight generally increase all of a sudden and the occurring frequency of GCEB and DPSC increase. The DPSC phenomenon indicating outburst risks is generally accompanied with GCEB,which form a linkage system and are triggered successively.

关 键 词：煤与瓦斯突出 钻屑量 型煤 失稳破坏 初始释放瓦斯膨胀能 

分 类 号：TD712[矿业工程—矿井通风与安全]