The invention discloses a curtain grouting technology for an ore body roof
karst fracture development and strong water-rich ore deposit. According to the technical scheme, firstly, upward exploration and injection holes are distributed, six upward exploration and injection holes with an
elevation angle of five degrees, six upward exploration and injection holes with an
elevation angle of 15 degrees and six upward exploration and injection holes with an
elevation angle of 25 degrees are distributed in each chamber, the exploration and injection holes are designed with the chambers as base points, all the exploration and injection holes of all the lengths are evenly distributed in the plane with a stagger angle of 60 degrees, the hole depth is 50 m, and the exploration and injection holes with the elevation angle of five degrees, the exploration and injection holes with the elevation angle of 15 degrees and the exploration and injection holes with the elevation angle of 25 degrees are evenly distributed in the plane with a stagger angle of 20 degrees; secondly, downward exploration and injection holes are distributed, the outward and downward exploration and injection holes with the angles of -5 degrees,-30 degrees and -60 degrees are distributed in end chambers, the hole depth is 50 m, all the downward exploration and injection holes are evenly distributed symmetrically in the plane, and the included angle is 10 degrees; thirdly, according to the requirement of accurate
mining engineering, grouting is carried out, and a grouting curtain is formed. The grouting curtain with the high water plugging rate is built under a mine according to roof
karst fractures, the functions of water separation and reinforcement can be achieved, ore bodies are released safely and efficiently under the protection of the grouting curtain, and technical guarantees are provided for safe and efficient mining of the mine.