Abstract
| Original language | English |
|---|---|
| Title of host publication | Proceedings-DFI/EFFC 11th International Conference on Piling and Deep Foundations |
| Publisher | Deep Foundations Institute |
| Number of pages | 10 |
| Volume | IC-2014 |
| Publication status | Published - 2014 |
| Event | DFI/EFFC 11th International Conference on Piling and Deep Foundations - Stockholm Fair, Stockholm, Sweden Duration: 21 May 2014 → 23 May 2014 https://www.regonline.com/builder/site/default.aspx?EventID=1221506 |
Conference
| Conference | DFI/EFFC 11th International Conference on Piling and Deep Foundations |
|---|---|
| Country | Sweden |
| City | Stockholm |
| Period | 21/05/14 → 23/05/14 |
| Internet address |
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Keywords
- Screw piles
- Renewable energy foundations
- Renewable resource
- Sand
Cite this
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Optimising the compressive behaviour of screw piles in sand for marine renewable energy applications. / Knappett, Jonathan A. (Lead / Corresponding author); Brown, Michael J.; Brennan, Andrew J.; Hamilton, Lewis.
Proceedings-DFI/EFFC 11th International Conference on Piling and Deep Foundations. Vol. IC-2014 Deep Foundations Institute, 2014. 1904.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
TY - GEN
T1 - Optimising the compressive behaviour of screw piles in sand for marine renewable energy applications
AU - Knappett, Jonathan A.
AU - Brown, Michael J.
AU - Brennan, Andrew J.
AU - Hamilton, Lewis
PY - 2014
Y1 - 2014
N2 - This paper investigates the compressive behaviour of screw piles in sands and the key design parameters which control this. These types of foundation elements have typically been used as screw anchors onshore (i.e. for their tensile capacity), but there is increasing interest in their potential use as compression piles for supporting offshore marine renewable energy (MRE) devices (e.g. wind and tidal turbines) in deeper water. For such foundation applications, the compressive capacity is as important as the tensile capacity and is not well understood, particularly in cohesionless soils which are a likely seabed condition in MRE applications. A 1-g laboratory study was initially conducted on small scale model screw piles in sand beds of various relative density between 25 – 88%. These experiments were used to validate a Finite Element (FE) model having a stress-dependent constitutive model, making it useful for future up-scaling of the pile size for field applications. Following validation, the FE model was used to conduct a parametric study on the effects of flange spacing ratio (s/Dflange) and flange to shaft diameter ratio (Dflange/Dshaft). By using a validated FE model for this study, it was possible to observe the failure mechanisms (through the shear strain distribution) within the soil and correlate these with the pile capacity. This information was then used to comment on the most optimal (cost-effective) pile design for supporting compressive loads. This study represents a key step towards producing design tools appropriate for the design of screw piles in MRE applications.
AB - This paper investigates the compressive behaviour of screw piles in sands and the key design parameters which control this. These types of foundation elements have typically been used as screw anchors onshore (i.e. for their tensile capacity), but there is increasing interest in their potential use as compression piles for supporting offshore marine renewable energy (MRE) devices (e.g. wind and tidal turbines) in deeper water. For such foundation applications, the compressive capacity is as important as the tensile capacity and is not well understood, particularly in cohesionless soils which are a likely seabed condition in MRE applications. A 1-g laboratory study was initially conducted on small scale model screw piles in sand beds of various relative density between 25 – 88%. These experiments were used to validate a Finite Element (FE) model having a stress-dependent constitutive model, making it useful for future up-scaling of the pile size for field applications. Following validation, the FE model was used to conduct a parametric study on the effects of flange spacing ratio (s/Dflange) and flange to shaft diameter ratio (Dflange/Dshaft). By using a validated FE model for this study, it was possible to observe the failure mechanisms (through the shear strain distribution) within the soil and correlate these with the pile capacity. This information was then used to comment on the most optimal (cost-effective) pile design for supporting compressive loads. This study represents a key step towards producing design tools appropriate for the design of screw piles in MRE applications.
KW - Screw piles
KW - Renewable energy foundations
KW - Renewable resource
KW - Sand
M3 - Conference contribution
VL - IC-2014
BT - Proceedings-DFI/EFFC 11th International Conference on Piling and Deep Foundations
PB - Deep Foundations Institute
ER -