煤矿深部开采煤岩动力灾害防控理论基础与关键技术

Theoretical basis and key technology of prevention and control of coal-rock dynamic disasters in deep coal mining

  • 摘要: 煤岩层赋存条件决定了煤矿深部开采条件下煤岩动力灾害的发生机理更趋复杂、防控难度显著增大,如何解决煤矿深部开采煤岩动力灾害防控问题,直接影响我国煤矿的安全生产和能源的有效供给。 针对“煤矿深部开采煤岩动力灾害防控技术研究”这一科学命题,基于冲击地压“三因素”机理和煤与瓦斯突出的综合作用假说,从煤岩动力灾害防控理论基础、关键技术和防控实践等3个方面,梳理澄清了煤矿煤岩动力灾害防控中的一些模糊概念,建立了用于统一描述冲击地压和煤与瓦斯突出发生机理的广义“三因素”(“物性因素”、“应力因素”及“结构因素”)理论,确定了我国煤矿典型冲击地压的4种类型(煤层材料失稳型、煤层结构失稳型、顶板断裂型、断层滑移错动型),分析了影响冲击地压和煤与瓦斯突出的主要因素,从思想认知、原则方法及技术核心等方面凝练了煤岩动力灾害多尺度分源防控技术,提出了深部开采冲击地压巷道“3级”吸能支护思想与成套技术,开发了煤与瓦斯突出井上下联合抽采防控技术和超高压水射流“横切纵断”防治复合煤岩动力灾害技术,并在现场开展了应用试验。 煤矿深部开采煤岩动力灾害防控理论与关键技术的建立与完善,为我国今后煤矿煤岩动力灾害的防治提供了科学依据。

     

    Abstract: The occurrence condition of coal and rock strata determines the more complex occurrence mechanism of coal-rock dynamic disasters in deep mining conditions with the significantly increasing difficulty of prevention and con trol technology. How to solve the problem of prevention and control of coal-rock dynamic disasters in deep coal mining directly affects the safety of coal mines production and the efficient energy supply in China. This paper focused on the scientific proposition that “Research on the prevention and control technology of coal-rock dynamic disasters in deep coal mining”. Based on the “Three Factors” theory in rock burst and the hypothesis of comprehensive effect in coal and gas outburst,the paper has clarified some vague concepts in the items of theoretical basis,key technology and in dustry practices in prevention and control of coal-rock dynamic disasters,and established a generalized “ Three Fac tors” theory to describe the mechanism of rock burst and coal and gas outburst,which is “ Physical Factor”,“ Stress Factors” and “Structural Factors”. Consequently,four types of typical rock burst in China’ s coal mines was identi fied:coal seam material instability type,coal seam structure instability type,roof fracture type,and fault slippage type. In addition,the paper analyzes the main factors that affect the rock burst and outburst,condenses prevention and con trol technology with different sources in multi-scales for coal-rock dynamic disasters from the aspects of ideology,prin ciples,methods. This paper also proposes a “ three-level” energy-absorbing method and packaged technology for the rock burst roadway support,and develops a combined surface and underground extraction prevention and control tech nology for coal and gas outburst mines,and a combination of ultra-high pressure water jet “cross-cutting and vertical breaking” coal-rock dynamic disaster prevention and control technology,of which application tests have been carried out on the site. The establishment and improvement of theories and key technologies for the prevention and control of coal-rock dynamic disasters in the deep coal mines could provide a scientific basis for the future prevention and control of coal-rock dynamic disasters in China.

     

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