TY - JOUR
T1 - Gentle Driving of Piles (GDP) at a sandy site combining axial and torsional vibrations
T2 - Part II - cyclic/dynamic lateral loading tests
AU - Kementzetzidis, Evangelos
AU - Pisano, Federico
AU - Elkadi, Ahmed S.K.
AU - Tsouvalas, Apostolos
AU - Metrikine, Andrei
PY - 2023
Y1 - 2023
N2 - 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.
AB - 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.
KW - Cyclic loading
KW - Dynamics
KW - Piles & piling
KW - Pile–soil gapping
KW - Sands
KW - Soil/structure interaction
UR - http://www.scopus.com/inward/record.url?scp=85146233122&partnerID=8YFLogxK
U2 - 10.1016/j.oceaneng.2022.113452
DO - 10.1016/j.oceaneng.2022.113452
M3 - Article
AN - SCOPUS:85146233122
SN - 0029-8018
VL - 270
JO - Ocean Engineering
JF - Ocean Engineering
M1 - 113452
ER -