1.National Engineering Laboratory for Deep Shaft Construction Technology in Coal Mine,Beijing ,China； 2.Beijing China Coal Mine Engineering Co.,Ltd.,Beijing China

Ground orientation horizontal hole coal seam floor pre-grouting prevention and control technology has become one of the main methods for prevention and control of coal seam floor water damage.Using ground directional horizontal hole,we can carry out advanced exploration and grouting control for coal seam floor aquifer.According to the formation conditions of the No.18031 working face of Zhaogu Mine,this paper introduces the technical scheme of prevention and control of water for surface directional horizontal hole coal seam floor grouting,including drilling layout,drilling trajectory and drilling structure.The technology of pipe laying,large water vertical ratio and horizontal drilling,horizontal section drilling and the vertical ratio of water sag reached 2.39.Increase the utilization of drilling and explored the limestone of the floor of No.18031 working face.And grouting control can provide references for further promotion of ground directional horizontal holes in water control of coal seam floor.The feasibility of coal seam floor grounting technology with ground oriented horizonal hole is verified.