Gentle Driving of Piles (GDP) at a sandy site combining axial and torsional vibrations

Gentle Driving of Piles (GDP) at a sandy site combining axial and torsional vibrations: Part II - cyclic/dynamic lateral loading tests

Kementzetzidis, Evangelos (IHE Delft Institute for Water Education)
Pisano, F. (TU Delft Geo-engineering)
Elkadi, A.S.K. (Deltares)
Tsouvalas, A. (TU Delft Dynamics of Structures; TU Delft Offshore Engineering)
Metrikine, A. (TU Delft Offshore Engineering; TU Delft Engineering Structures)

Engineering Structures

2023

Gentle Driving of Piles (GDP) is a new technology for the vibratory installation of tubular (mono)piles. Its founding principle is that both efficient installation and low noise emission can be achieved by applying to the pile a combination of axial and torsional vibrations. Preliminary development and demonstration of the proposed technology are the main objectives of the GDP research programme. To this end, onshore medium-scale tests in sand have been performed on piles installed using both impact and vibratory driving methods (including GDP). While the results of the installation tests are presented by Tsetas et al. (2023), this work focuses on the post-installation performance of GDP-driven piles under a sequence of slow/large-amplitude (cyclic) and faster/low-amplitude (dynamic) load parcels. The field data point out the influence of onshore unsaturated soil conditions, which result in complex cyclic pile stiffness trends due to the interplay of pile–soil gapping and soil's fabric changes. The pile stiffness under small-amplitude vibrations is strongly correlated with the previous response to large load cycles, and noticeably frequency-dependent for load cycles with a period lower than 1 s. Overall, the post-installation performance of GDP-driven piles appears to be satisfactory, which encourages further development and demonstration at full scale.

Cyclic loading
Dynamics
Piles & piling
Pile–soil gapping
Sands
Soil/structure interaction

http://resolver.tudelft.nl/uuid:90e782ab-17fd-42c5-b9e4-79c6fbf92e03

https://doi.org/10.1016/j.oceaneng.2022.113452

0029-8018

Ocean Engineering, 270

Institutional Repository

journal article

© 2023 Evangelos Kementzetzidis, F. Pisano, A.S.K. Elkadi, A. Tsouvalas, A. Metrikine