Design Parameters for Shaft Resistance of Driven Monopiles and Suction Buckets from Rate-Dependent Interface Tests

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4. Design Parameters for Shaft Resistance of Driven Monopiles and Suction Buckets from Rate-Dependent Interface Tests

ABSTRACT:  This paper describes how interface tests combined with pore water pressure measurements (IS-P), can be used to calculate the shaft capacity of offshore monopiles and suction buckets. A novel interface shear apparatus equipped with pore water pressure measurement was developed for conducting interface tests on samples from three different soil types. The beta  values used for calculating skin friction for piles were derived from the test results. Effective stress parameters were solely used for the calculated beta values. Moreover, the results demonstrate rate dependence of interface strength and the corresponding beta values. The rate dependence is also evident in the magnitude of the excess pore water pressure produced. Additionally, the pore water pressure values displayed different types of time dependency depending on the rate of loading. Consequently, the calculated effective normal stress values were influenced accordingly. These phenomena exhibited varying effects depending on the type of soil. Studies suggest that variations in rate effect along the pile length may be influenced by the soil's stress state. In general, beta values ranging from 0,018 to 0.51 were calculated from from the conducted IS-P tests. It was observed that IS-P tests can serve as a valuable supplementary method for determining parameters essential for analysing pile shaft capacity.

5th International Symposium on Frontiers in Offshore Geotechnics (ISFOG2025)

11 - Suction installed foundations and anchors