# Interpretation of Vibratory Pile Penetration Based on Digital Image Correlation

## Abstract

A combined interpretation of force measurements together with the evaluation of dynamic motion around the pile based on digital image correlation (DIC) is performed to identify soil deformation during vibratory pile driving in model tests. The tests are executed under water-saturated 1g-conditions. We prove the occurrence of the so-called cavitational pile driving but without the experimental evidence of the forming of a cavity under the pile tip. Using the DIC results, first attempts are made to evaluate the volumetric cyclic deformation of soil around the pile tip during the vibro-penetration. The results show an alternation of contractancy and dilatancy in proximity of the pile tip with volumetric peak-to-peak strain amplitudes up to 2 %. They indicate drained or at least partially drained conditions. Based on the test results, existing phenomenological interpretations of soil deformation due to pile penetration are reviewed.

## Keywords

Model pile Tip resistance Vibratory pile driving Slow and fast vibratory pile driving Cavitational and non-cavitational pile driving## References

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