The invention relates to the technical field of
geotechnical engineering and underground hidden
engineering construction, and discloses a
karst area
pile foundation intelligent positioning and precise construction method which comprises the steps that a
drill string dynamic model is established, and the
mechanical impedance and the mechanical equivalent aperture of the bottom of a
drill bit are inverted; generating a preset hydraulic impedance
boundary model based on the mechanical parameter mapping; the actually measured equivalent flow resistance is analyzed in the pouring stage, and the effective hydraulic aperture is reversely deduced; and calculating the flow resistance deviation and aperture deviation of the actually measured parameters and the
reference model, identifying geological defect types such as laterally communicated
karst caves, plastic hole shrinkage and hole wall collapse according to the deviation combination, and generating a corresponding
adaptive control instruction. According to the method, the characteristics of the drilling
machine are converted into the pouring rheological benchmark, and double deviation analysis of mechanical and hydraulic aperture is utilized, so that precise recognition of hidden
karst defects and closed-loop self-
adaptive control of the construction process are realized, and the
pile forming quality and the construction safety in a complex karst geological environment are guaranteed.