Review of the mechanical behavior of cast-in-place concrete large-diameter pipe piles

Abstract:

Soft soil regions are characterized by high water content， large void ratio， low bearing capacity， and high compressibility. Traditional pile foundations often face challenges such as poor construction quality and low bearing efficiency in such ground. The cast-in-place concrete large-diameter pipe pile （PCC pile）， as a novel foundation technology suitable for soft soil improvement， has its mechanical behavior critically important for engineering safety and performance. This paper systematically reviews the research progress on the mechanical behavior of PCC piles， including internal friction resistance， negative skin friction， vertical bearing， horizontal bearing， and pull-out resistance. It summarizes findings from multiple technical approaches， such as laboratory model tests， field tests， finite element and discrete element numerical simulations， and theoretical derivations. The influencing factors， distribution patterns， and calculation methods for each mechanical characteristic are clarified. Analysis indicates that current research still has shortcomings in the quantitative characterization of internal friction resistance， the time-dependent evolution mechanism of negative skin friction， the response under complex loading conditions， and pile group interaction effects. Future research should focus on the coupling of multiple methods， refined modeling， and validation through engineering field measurements to enhance the scientific basis and practical applicability of PCC pile design， thereby promoting broader application of this technology in high-speed railways， port engineering， anti-floating structures， and related fields.