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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。
In order to further improve the mechanism of coal and gas outburst, the paper summarizes the existing research results and the environment of coal and gas outburst geological structure, combines the research on coal and gas outburst mechanism with engineering structure, and puts forward the key structural body model of coal and gas outburst , And analyzes the process of coal and gas outburst. Through theoretical analysis, the mechanical criterion Cm and energy criterion Ce for starting coal and gas outburst are established to make the disaster-causing theory of the key structure of coal and gas outburst. The results show that: the tectonic movement formed tectonic coal, creating a high stress environment conducive to prominently occurring, providing the geological structure conducive to gas preservation and prominence; the prominent coal with the medium properties of high-energy gas and tectonic coal, coal and gas The prominent basic conditions are also the main sources of energy in the process of highlighting. The key structure is the necessary condition for successful start of coal and gas outburst. According to the key structure model, the delay of coal and gas outburst is divided into quasi-static load D-QSL and I-DL under dynamic loading. The process of coal and gas outburst undergoes the preparation, start-up, development and termination of four phases. The prominent preparatory phase begins with the geological tectonic movement of coal Transformation, highlighting the excitation instability of the structure 2, belonging to the outstanding preparatory stage, highlighting whether the successful start-up depends on the structure of the force-energy conditions; using the key structural body model and highlight the start of the force-energy criteria can be revealed The initiation mechanism of typical coal and gas outburst accidents can provide guidance for the prediction and prevention of coal and gas outburst.