敏东一矿软岩区地下水注浆治理技术及应用研究

Application research on groundwater grouting treatment technology in the soft rock area of Mindong No.1 Mine

摘要:

由于敏东一矿南一采区覆岩岩性较软且粘土成分含量较高，造成采空区垮落带的储水空间有限，煤矿面临的矿井水外排压力和地下水保护问题尤为突出。通过对导致地下水涌漏的原因进行分析，认为煤层开采引起的覆岩导水裂隙是造成地下水涌漏的主要根源，而采用地面钻孔、人工注浆封堵方法隔绝地下水泄流通道，实施帷幕注浆加固技术对巷道导水裂隙进行封堵，可以有效封堵覆岩导水裂隙。实践证明，根据矿区的地质和水文条件，按照隧道帷幕注浆工程设计和施工流程，优选注浆孔位置、间距、注浆材料和浆液配比、钻孔结构和注浆施工参数等，采用孔内止浆花管注浆对巷道软围岩进行帷幕灌浆，使巷道软围岩裂隙得到充分充填和加固，是解决矿区矿井水“零排放”难题、实现地下水保护的重要途径。

Abstract:

Mining water discharge and groundwater protection is at issue due to the limited water storage space in the goaf collapse zone due to the relatively soft overlying rock with high contents of clay in the south mining area of Mindong No.1 Mine. With analysis of the groundwater leakage causes， it was concluded that the overlying rock fractures produced by coal mining was the main source of groundwater leakage； meanwhile， the water channeling cracks in the overlying rock can be effectively blocked with artificial grouting via boreholes to block the groundwater discharge channel and curtain grouting reinforcement technology to seal off water channeling cracks in the roadway. Field application has proven that curtain grouting with in-hole screen pipes in the soft surrounding rock of the roadway to fully fill and reinforce the cracks in the soft surrounding rock is an important way to achieve “zero discharge” and groundwater protection of mining water in the mine through proper selection of the location of the grouting holes， spacing， grouting material and slurry ratio， borehole structure and drilling parameters according to the engineering geological conditions of the mining area.