地面定向孔靶向治理导水断层技术实践

Practice of targeted ground directional hole management technology for water conducting fault

唐家会煤矿主采华北型石炭二叠系6号煤,6号煤为带压开采煤层,煤层底板承受奥灰水压力约为1.5 MPa,煤层与奥灰距离约为40~60 m,由于6煤底板奥灰富水性强且断层发育,因此6号煤安全开采受到底板奥灰水的威胁较大。煤矿西翼盘区发育DF2为断层,断层落差18 m,西翼盘区运输巷必须过该断层,为此开展地面治理工程,利用大孔径定向钻孔对DF2断层的灰岩根部进行注浆封堵,2019年井下运输巷安全通过DF2断层,揭露断层时无水,断层带中有水泥结块,证明断层带被水泥浆充填加固彻底,治理效果较好。

Tangjiahui Mine No.6 coal seam remains North China type Carboniferous Permian system.No.6 coal seam mined under pressure,and the coal seam floor was subjected to O-ash water pressure of about 1.5 MPa,and the distance between the coal seam and O-ash is about 40-60 m.Because of the strong water-richness of No.6 coal and the fault development,the safe mining of No.6 coal was threatened by ash water at the bottom.The DF2 fault was developed in the west wing of the mine,and the fault drop was 18 m.The transportation roadway in the west wing must pass the fault,so the ground treatment project was carried out,and the tuff roots of the DF2 fault were grouted and blocked by using large-diameter directional drilling,and the underground transportation road safely passed the DF2 fault in 2019,and there was no water when the fault was exposed,and there were cement lumps in the fault zone,which proved that the fault zone was filled with cement slurry and reinforced thoroughly.The treatment effect was good.