With the increasing use of auger pressure grouted (APG) piles in newconstruction, it is important that proper design parameters be incorporated whenevaluating pile capacity and performance using reliability-based design methods.This paper focuses upon developing t-z model parameters and their variability fromanalysis of static axial compression tests on APG piles. Data from ten static pile loadtests conducted on APG piles from construction sites and literature were obtained.Load-settlement curve fittings between the measured data and the theoretical datawere conducted using the t-z method to back-calculate a set of soil-pile interfacialand tip parameters. The t-z model parameters are compared to standard fieldinvestigation data, including standard penetration test (SPT), cone penetration test(CPT) and effective stress of the ground to develop correlations suitable for thedesign of APG piles. Subsequently, the t-z model for APG pile design was developedand the model efficiency was evaluated by comparing the predicted and measuredload-settlement and load transfer curves.
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