Underwater grouting and water plugging method for vertical shaft

The invention discloses a vertical shaft underwater grouting and water plugging method, which belongs to the technical field of mine shaft tunneling, and comprises the steps of underwater slag throwing, cement paste injection, water topdressing and drainage, grouting pad pouring, working face grouting and the like. According to the method, the stability of surrounding rocks is fundamentally enhanced, the vertical shaft tunneling safety is guaranteed, the tunneling speed is increased, underwater slag throwing and working face grouting are combined, underwater slag throwing and water sealing are conducted before working face grouting, the slag throwing amount, the slag throwing thickness and the thickness of a grout stopping pad are scientifically calculated, manganese ore underwater grouting under the final grouting pressure of 13 Mpa is achieved, and the grouting efficiency is improved. Slag throwing and water sealing are combined with the working face, and conditions are created for water sealing and safety