This paper presents a method for estimating the initial stiffness of the load-displacement of a pile (pile head stiffness) from the Sonic Integrity Test (SIT). Basically, the proposed method is identical to wave form matching commonly used for the interpretation of dynamic load testing. Validity of the proposed method was examined through a series of SITs and static load tests (SLTs) of a model pile, 800 mm in length and 25 mm in diameter, embedded in model grounds having different profiles of shear modulus of the soils. The proposed method was further applied to the field tests of two cast-in-situ concrete piles where SITs and SLTs were conducted. It is shown from the model tests and the field tests that the proposed method gives us a good estimate of the initial stiffness of the load-displacement curve of a pile.
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