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    煤田火灾“时空−分级−适配”环境减损灭控原理及关键技术

    Spatio-temporal, graded, and adaptive approach to environmentally loss-reduction in coal mine fire control: Principles and key technologies

    • 摘要: 煤田火灾是造成环境损伤、阻碍生态修复、威胁矿区安全的重大灾害。针对煤田火区演化蔓延特征复杂、不同火区治理技术措施环境损伤差异性大、生态修复困难等突出问题,系统调研国内煤田火区现状并开展理论分析,厘清火区数量增加的主要原因:煤层露头火区(煤田火区)由地表向地下深部蔓延,矿井火灾由地下深部向地表发展,燃烧形式由零星的单点燃烧转向串联燃烧,形成了兼具浅表煤层露头和深部矿井火灾蔓延特征的复合煤井田火区。总结分析了煤井田火从常温动态发展至燃点的非线性渐变过程,概括了我国煤田火区治理的2类主要技术,即“剥挖移除”与“原位治理”,明晰了“剥挖移除”效果显著、工程量大、环境损伤大和“原位治理”灭控周期长、费用低、环境损伤小的成效、经济及环境损伤特征。结合煤井田火区的形成演化蔓延规律和浅表露头火灾环境损伤大、深部矿井火灾环境损伤小的特点,将火区沿垂向划分为浅部、中部、深部3个区域,确定了“浅剥、中充、深控”的煤井田火区治理总体思路。依据《煤田火灾灭火规范》,明确煤井田火灾治理的温度阈值,将火区燃烧程度划分为低温( < 70 ℃)、中温(70 ℃~燃点)、高温( > 燃点) 3个等级。综合考虑煤井田火灾的分区分级特征,以及剥挖煤体、钻注充填、覆盖压实的时序性及环境损伤效应,针对不同区域、不同燃烧程度的火区,确定适配的技术和适宜的时序,构建了“时空−分级−适配”环境减损灭控理论与技术体系,并在贺兰山煤井田火区开展了工程应用。

       

      Abstract: Coalfield fires are major disasters that cause environmental damage, hinder ecological restoration, and threaten mining area safety. To address the challenges of complex propagation characteristics of coal field fires, significant differences in environmental damage caused by various fire control measures, and difficulties in ecological restoration, this study conducted a survey and theoretical analysis of the current state of coal field fires in China. The main reasons for the increasing number of fire zones were clarified: coal seam outcrop fires (coal field fires) spread from the surface to the deep underground, while mine fires develop from the deep underground toward the surface, and sporadic single-point combustion transitions into series combustion, forming a composite coal mine field fire zone that combines the characteristics of shallow coal seam outcrop fires and deep mine fires. The nonlinear gradual process of coal mine field fires from ambient temperature to the ignition point was analyzed. The two main fire control technologies used in China — “excavation and removal” and “in-situ treatment” — were summarized, clarifying that “excavation and removal” is effective but involves large engineering volume and highly environmentally damaging, whereas “in-situ treatment” has a long control cycle, low cost, and low environmental damage. Based on the formation, evolution, and propagation patterns of coal mine field fires, and considering the high environmental damage of shallow outcrop fires and the low environmental damage of deep mine fires, the fire zones were vertically divided into three parts: shallow, middle, and deep. The overall fire control strategy of “shallow excavation, middle filling, and deep containment” was established. According to the Code for Coal Field Fire Control, the lower and upper temperature limits for coal mine fire control are specified, and the combustion degree of the fire zones is classified into three levels: low temperature (< 70 ℃), medium temperature (70 ℃−ignition point), and high temperature (> ignition point). Taking into comprehensive consideration the “zoning and grading” characteristics of coal mine fires, as well as the timing and environmental damage effects of coal excavation, drilling-and-grouting filling, and covering and compaction, appropriate technologies and suitable timing are determined for fire zones of different zones and combustion degrees. A theoretical and technical system of “spatio-temporal, graded, and adaptive” environmentally loss-reduction fire control is established, and engineering application has been carried out in the Helan Mountain coal mine fire zone.

       

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