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典型煤矿区顶板含水体充水模式与控水开采技术研究及实践

Study and practice of water filling mode and water control mining technology in typical coal mine area under roof water body

  • 摘要: 针对我国典型矿区顶板含水体下厚及特厚煤层开采水害防控与水资源保护问题,基于对典型矿区顶板含水体赋存特征以及与主采煤层的空间关系, 提出了“弱固结水砂溃涌、高承压渐进充水、高位巨厚含水层渗透充水、上下行裂缝渐进导通式充水、侧向大通道强补给充水”等5种顶板含水体充水模式; 基于“扰动范围和充水量双重控制”的控水开采技术, 构建了“含水体精细探测、覆岩破坏精准控制、充水量可控疏降、水情协同监测预警”为一体的煤矿顶板含水层控(保)水开采理论及技术体系; 提出了考虑关断时间效应的瞬变电磁法精准探测、高厚及特厚煤层高强度采动导水裂缝带高度预计、基于排水能力约束的顶板含水层采前精准预疏降、预裂弱化坚硬主控覆岩控制导水裂缝带高度、包括“含水层水位绝对值、变化速度以及变化趋势”三参量的水文监测预警等控水开采关键技术; 针对我国部分典型矿区顶板含水层控水开采实践, 提出了相应的控水开采模式, 取得了不同顶板充水含水体下控水采煤成果, 研究成果可为解放水体下压煤、实现安全高效绿色开采提供参考。

     

    Abstract: For water hazard prevention and control as well as water resource protection in typical mining areas with thick and extremely thick coal seams under water-bearing strata, nearly 30 years of practical experience in mining under water-bearing strata were summarized and refined. This has led to the development of a water control (protection) technology model suitable for typical mining areas in China. Based on the occurrence characteristics of water-bearing roof in typical mining areas and the spatial relationship with the main coal seam, five water filling models were proposed, that is, weakly consolidated water sand collapse, high pressure progressive water filling, high-positioned thick water-bearing strata permeation, upward and downward cracks progressive conduction water filling, and lateral large channel strong recharge water filling. Based on the dual control of disturbance range and water filling volume, an integrated theory and technical system for controlled (protecting) water in coal mine roof water-bearing strata were established, including precise detection of water-bearing strata, precise control of overburden damage, controllable reduction of water filling volume, and coordinated monitoring and early warning of hydro logical conditions. Key technologies were proposed, such as precise detection using transient electromagnetic methods considering shutdown time effects, height estimation of high-intensity mining-induced conductive fracture zones in thick and extremely thick coal seams, pre-mining precise pre-reduction of roof water-bearing strata based on drainage capacity constraints, weakening hard main control overburden to guide the height of conductive fracture zones, and hydrological monitoring and early warning involving three parameters of absolute value, change rate and trend of water level in water-bearing strata. For the water control practice of roof water-bearing strata in some typical mining areas in China, corresponding water control mining models have been proposed, achieving sucess in water control for mining under different types of water-bearing strata. The research findings provide scientific reference for coal mining under water-bearing strata, realizing safe, efficient and green mining.

     

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