Ultrahigh-pressure jet grouting pile auxiliary anti-seepage method for anti-seepage wall of earth and rockfill dam with deep covering layer

The invention discloses a deep covering layer high earth and rockfill dam anti-seepage wall ultrahigh pressure jet grouting pile auxiliary anti-seepage method, and belongs to the technical field of building construction. The method comprises the steps of foreground arrangement, background arrangement and waste slurry sedimentation tank arrangement; determining the reinforcing position of the concrete diaphragm wall, measuring and setting out the reinforcing position, and numbering; guide hole construction; an ultrahigh-pressure jet grouting pile main machine is adopted for conducting ultrahigh-pressure jet grouting on formed holes, and reinforcing is conducted to form a single pile; and the ultrahigh-pressure jet grouting pile main machine is moved to the next pile position, and according to the reinforcing requirement of the anti-seepage wall of the earth and rockfill dam with the deep covering layer height, reinforcing of all the engaged row piles is completed. By arranging the ultrahigh-pressure jet grouti