Pile bottom bearing layer karst cave treatment construction method

The invention relates to the technical field of pile bottom karst cave treatment construction, and discloses a pile bottom bearing layer karst cave treatment construction method. The method comprises the following steps that (1) electrical method holes are drilling in two sides of a pile foundation correspondingly, and whether a karst cave exists at the pile bottom and whether a water filler exists in the karst cave are determined by adopting an inter-hole ultra-high density electrical method; (2) an infusion hole is formed by chambering a coring hole, an exhaust hole is formed by drilling, and the infusion hole and the exhaust hole respectively communicate with the karst cave; (3) the inner end of an infusion tube penetrates through the infusion hole and extends to the karst cave, and the outer end of the infusion tube is used for being in butt joint with the outside; (4) high-pressure airflow or high-pressure water is input through the infusion pipe for flushing; and (5) a ground pump is started, and concre