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| Key structural body theory of coal and gas outburst |
| SHU Longyong1,2,3,WANG Kai1,QI Qingxin2,3,FAN Shaowu2,3,ZHANG Lang2,3,FAN Xisheng2,3 |
(1. School of Resource and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;2. Mine Safety Technology Branch,China Coal Research Institute,Beijing 100013,China;3. State Key Laboratory of Coal Mining and
Clean Utilization,China Coal Research Institute,Beijing 100013,China)
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Abstract 为了进一步完善煤与瓦斯突出机制,通过对已有研究成果和煤与瓦斯突出地质结构环境的总结分析,将煤与瓦斯突出机制研究与工程结构相结合,提出煤与瓦斯突出的关键结构体模型,并对煤与瓦斯突出过程进行剖析,通过理论分析建立煤与瓦斯突出启动的力学判据Cm和能量判据Ce,形成煤与瓦斯突出关键结构体致灾理论。研究结果表明:地质构造运动形成构造煤体,营造利于突出发生的高应力环境,提供利于瓦斯保存和突出启动的地质结构环境;突出煤体具备高能瓦斯和构造煤的介质属性,是煤与瓦斯突出的基本条件,也是突出过程中能量的主要来源,关键结构体是煤与瓦斯突出得以成功启动的必要条件;依据关键结构体模型,煤与瓦斯突出分为准静载作用下的延迟突出(D-QSL)和动载作用下的瞬时突出(I-DL)2种类型;煤与瓦斯突出过程经历准备、启动、发展和终止4个阶段,突出准备阶段始于地质构造运动对煤体的改造,突出激发表现为结构2的突变失稳,隶属于突出准备阶段,突出能否成功启动决定于结构1的力–能条件;利用关键结构体模型和突出启动的力–能判据能够揭示典型煤与瓦斯突出事故的启动机制,可为煤与瓦斯突出预测与防治提供指导。
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