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    煤矿区含水层结构保护理论、技术与应用

    Theory, technology, and application of aquifer structure protection in coal mining areas

    • 摘要: 国家要求强化黄河流域地下水水位管控,不仅是保护地下水系统健康的迫切需求,也是保护地表生态系统的重要举措。高强度煤炭开采对黄河流域地下水水位扰动强烈,保护煤炭基地含水层结构,是实现水位管控的唯一途径。以煤矿区地下水水位管控和地下水系统保护为目标,以煤矿区规划和采煤技术方法为手段,集成创新了采动裂隙场探测技术,发明了“五图−三带−两分区”含水层结构保护分区预测技术,制定了含水层结构保护系列标准,形成了基于水位−水量协同控制的含水层保护理论与技术体系。采用钻孔岩心观察、井下窥视、测井曲线解译、微电阻率测井和三维地震等综合方法,探测顶板导水裂隙带、底板破坏深度等采动裂隙场发育范围,采用红外辐射探测方法准确定位煤岩裂隙发育区。创新了煤层顶、底板含水层保护的采煤技术,形成了以分层限高开采、连采连充、壁式条带充填等为主的煤层顶板含水层结构保护技术,以及煤层底板构造与地层薄弱破碎带注浆保水技术。开发了保水采煤效果一体化动态监测软件和信息平台,研制了精准探测地下水流速流向仪器设备,揭示了矿区天然和采动渗流场演化规律,建成了省级煤矿区地下水监测预警系统和监测网,为黄河流域大型煤炭基地地下水水位管控、地下水系统保护提供了理论和技术支撑。

       

      Abstract: The national requirement to strengthen the control of groundwater level in the Yellow River Basin is not only an urgent need to protect the health of the groundwater system, but also an urgent need to protect the surface ecosystem. High intensity coal mining causes strong disturbance to the groundwater level in the Yellow River Basin, and protecting the aquifer structure of coal bases is the only way to achieve water level control. With the goal of controlling the groundwater level and protecting the groundwater system in coal mining areas, and using coal mining area planning and mining technology methods as means, the detection technology of mining-induced fracture fields has been integrated and innovated, the “Five Diagram−Three Belt−Two Zone” aquifer structure protection zoning prediction technology has been invented, a series of aquifer structure protection standards have been formulated, and a theoretical and technical system for aquifer protection based on water level and water quantity coordinated control has been formed. Comprehensive methods such as drilling core observation, downhole observation, logging curve interpretation, micro resistivity logging, and 3D seismic are used to detect the development range of mining induced fracture fields such as the water conducting fracture zone on the roof and the depth of bottom plate damage. Infrared radiation detection method is used to accurately locate the coal rock fracture development zone. Innovative coal mining technology has been developed for the protection of coal seam roof and floor aquifers, forming a coal seam roof aquifer structure protection technology mainly based on layered height limit mining, continuous mining and filling, wall strip filling, etc., as well as a coal seam floor structure and weak fractured zone grouting water retention technology. With the goal of water conservation and coal mining effect monitoring, an integrated dynamic monitoring software and information platform for water conservation and coal mining effects has been developed, instruments and equipment for accurately detecting groundwater flow velocity and direction have been developed, the evolution laws of natural and mining-induced seepage fields in mining areas have been revealed, and a provincial-level groundwater monitoring and early warning system and monitoring network for coal mining areas have been established. This provides theoretical and technical support for the control of groundwater levels and protection of underground water systems in large-scale coal bases in the Yellow River Basin.

       

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