Post-grouting method of cast-in-place pile in carbonaceous limestone geological environment

The invention provides a post-grouting method of a cast-in-place pile in a carbonaceous limestone geological environment, and belongs to the technical field of civil engineering foundation construction. The post-grouting method is characterized in that advanced drilling detection is carried out on the pile position geological environment before the construction of the cast-in-place pile, the position of the karst cave of the pile can be accurately judged during the advanced drilling detection, when a steel reinforcement cage is manufactured and grouting pipes are installed, the grouting pipesare correspondingly installed at the middle position of the corresponding karst cave and the pile bottom, and grouting can be carried out on the cast-in-place pile after the pile is formed for three days. The post-grouting method aims to solve the problems that the influence on the integrity of a pile body of the cast-in-place pile, the friction force of the pile body and the bearing capacity of the pile end exists under