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