煤矿采空区破损煤岩层的渗透性研究

Permeability Performance of Fractured Coal and Rock Formations in Goaf

利用矿井资源修建地下储库有助于实现“碳达峰,碳中和”战略目标,保障国家能源安全。掌握矿井储存空间内煤岩层渗透特性,是确定地下储库储存容量,保障储能系统稳定性和安全性的前提。本文以灵新煤矿矿井浓盐水地下储库工程为背景,开展现场原位压水试验,对采掘完成的矿区煤岩层渗透特性进行研究,探明了矿区遗留煤柱、采区顶、低板的渗透特性和透水能力。试验结果表明各煤层遗留煤柱的稳定流量值为1.0~6.12 L/min,15和16煤顶板稳定流量为1.76~8.82 L/min,16煤的底板稳定渗流量为1.971~8.82 L/min。在此基础上,计算了各层煤柱透水率为0.046~0.261 Lu,顶板透水率为0.07~0.162 Lu,底板透水率为0.042,其中16煤煤柱透水率最大,为0.261 Lu。煤岩层透水性较差,有利于修建地下储库工程。

Ensuring national energy security and achieving the strategic objective of“carbon peaking and carbon neutrality”can be facilitated by utilizing mining resources to construct underground storage.Determining the storage capacity of the subterranean reservoir and guaranteeing the stability and safety of the energy storage system need an understanding of the permeability properties of coal and rock layers in the mine's storage area.Based on the concentrated brine underground storage project of Lingxin Coal Mine,this paper carried out an in-situ water injection test to study the permeability characteristics of coal and rock in the mining area,and investigate the permeability characteristics and water permeability of the remaining coal pillars,the top and the low plates of coal seams.The test findings indicate that the top plate of coals 15 and 16 has a stable flow rate of 1.76~8.82 L/min,the bottom plate of coals 16 has a steady infiltration volume of 1.971.76~8.82 L/min,and the stable flow value of the heritage coal pillar of each seam is 1.0~6.12 L/min.On this basis,the permeability of the coal pillar in each seam is calculated to be 0.046~0.261 Lu,that of the top plate to be 0.07~0.162 Lu,and that of the bottom plate to be 0.042 Lu.The permeability of the coal pillar in the 16 coal seams is the biggest,measuring 0.261 Lu.Overall,coal and rock formations have poor water permeability,which is conducive to the construction of underground storage projects.Relevant research provides a foundation for the design and operation of underground storage.