Construction method for post-grouting solidified mud cake on pile side of cast-in-place pile

The invention relates to the technical field of cast-in-place piles, and discloses a cast-in-place pile side post-grouting solidified mud cake construction method which comprises the following construction steps that (1) after cast-in-place piles are formed in a cast-in-place mode, the cast-in-place piles are internally provided with reinforcement cages, and pile side soil layers are arranged on the peripheries of the cast-in-place piles; a plurality of annular grouting pipes are arranged on the reinforcement cage, the annular grouting pipes are arranged at intervals in the axial direction of the reinforcement cage, and a plurality of peripheral grouting openings are formed in the annular grouting pipes; each annular grouting pipe is connected with a vertical grouting pipe, and a grouting opening is formed in the top of each vertical grouting pipe. Within 7-8 hours after the cast-in-place pile is cast and formed, unplugging is conducted on the multiple vertical grouting pipes and the multiple annular grouting