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By V. M. Starzhinskii

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6 a Chronological evolution of displacements of the pile and a point below the pile tip for three selected cycles from DIC and b location of the observation points the soil between the considered point and the pile tip. 35 mm cannot justify the displacement of about 1 mm necessary to mobilize tip resistance (between the moments 1 and 2 in Fig. 5). In the case of a formation of a cavity below the pile tip, one could also expect to detect the subsequent impact as a sharp bend in the displacement curve of the soil.

Interpretation of Vibratory Pile Penetration Based on Digital Image Correlation 47 Important conclusions from the experimental results are: • The evolution of tip resistance observed in the test results presented above indicates cavitational pile driving. The characteristic points on the piles’ force-displacement curve correlate with sudden changes in the directions of displacement/deformation in the soil. • Under water, the forming of a gap or cavity is not a necessary condition for the occurrence of slow or cavitational pile driving.

The other interesting observation is that obviously boundary effects lead to a qualitatively different penetration behavior. While the larger pile shows a parabolic increase of penetration resistance with depth as discussed above, for the small diameter pile this behavior is observed only on the first 20 cm of penetration. In about this depth, the penetration resistance reaches an inflection point and increases only sub-linearly afterward. The BC plays only a minor role compared to the larger pile.

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