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祁东矿煤与瓦斯突出动力成因分析
供稿: 雷东记;赫少攀;郭晓洁;孟慧 时间: 2018-11-19 次数:

作者:雷东记;赫少攀郭晓洁孟慧

作者单位:河南省瓦斯地质与瓦斯治理重点实验室(省部共建国家重点实验室培育基地)中原经济区煤层(页岩)气河南省协同创新中心河南煤化工集团永锦能源有限公司

摘要:针对祁东矿多发生小型突出且地点多在构造应力区的现状,采用划分地质单元方法评价其煤与瓦斯突出危险性。结果表明:4个地质单元瓦斯赋存条件和主控因素不同,25次突出集中发生的第Ⅱ单元,主控因素为地应力;测试了原岩地应力场特征,发生多次突出的中央回风下山巷道走向为近SN向,与最大主应力方向夹角大,掘进过程中煤体承受应力较大,构造煤发育;对比同一埋深其它已揭露煤层区域,在瓦斯含量相差不大的情况下,动力现象差异很大;这些都证实瓦斯不是突出的主要动力来源,突出主要动力来源为构造应力,这也决定了不会发生大型煤与瓦斯突出,对瓦斯预测和防治有重要指导意义。

基金:国家“十二五”科技重大专项课题(2011ZX05040-005);河南省瓦斯地质与瓦斯治理重点实验室(省部共建国家重点实验室培育基地)外部开放基金资助项目(WS2013A11);河南省教育厅科学技术重点研究项目(14A440008);

关键词:煤与瓦斯突出;地质单元;构造煤;地应力场;

DOI:10.16186/j.cnki.1673-9787.2015.01.005

分类号:TD713

Abstract:Based on the present situation in Qidong mine that coal and gas outburst mainly take place small outburst and the place concentrated in a tectonic stress area,it is adopted to divide geological units to evaluate the risk of coal and gas outburst hazard.The results showed that(1) there were different gas deposit conditions and main controlling factors of 4 geological units,25 outbursts focus taken place on theⅡ unit and the main controlling factor is ground stress;(2) based on the test of ground original rock stress field characteristics,outbursts repeatedly occurred on central air return diphead the roadway nearly towards SN direction,and the angle of the direction of the maximum principal stress was very large and coal body withstood greater stresses when excavating process and tectonic coal were developed;(3) in the case of the gas content with little difference,contrast to the same depth of other coal seams regions which had been revealed,dynamic phenomenon had a great difference.All of them have confirmed that the main power of outbursts is not source of gas but tectonic stress areas,at the same time it also determines that large coal and gas outburst will not occur,which has a great significance to the prediction and prevention of gas.

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