Coal mining waterproof soil layer rotary jet grouting reconstruction method

The invention discloses a coal mining waterproof soil layer rotary jet grouting reconstruction method, and relates to the technical field of geology and mining engineering.The coal mining waterproof soil layer rotary jet grouting reconstruction method comprises the steps that before a coal face is mined, the thickness of a waterproof soil layer is obtained according to a drill hole histogram; in a coal mining stage, a periodic weighting step pitch and an initial weighting step pitch are obtained through mine ground pressure observation; after coal mining is completed on the coal face, a plurality of detection drill holes are formed in the ground of a coal mine area; after coal mining collapse is stable, the average width of internal surface cracks and the average width of boundary surface cracks of the coal face are obtained through ground observation; implementing an internal jet grouting drilling group in the coal face; and implementing a boundary jet grouting drilling group on the boundary of the coal face