Abstract
An experimental campaign to investigate sea ice ridge interaction with bottom-fixed structures was carried out in the Aalto ice tank in Espoo Finland in August, 2019. The aim was to investigate a) the scaled ridge properties, b) the ice processes during testing and c) the scaling of ridge forces with respect to a cylindrical and a conical structure at the water line. This presentation focuses on
analyzing ridge keel punch tests. In a punch test, a circular platen of consolidated layer is first cut free from the surrounding ice field. Thereafter, the ice is pushed vertically downwards with a cylindrical indentor to break the underlying keel. The measured load-displacement relationship can be used for the evaluation of the mechanical properties of rubble. Three ice sheets were created and used to build ridges, in which the ridge consolidation temperature and time were varied. All together 24 punch tests were carried out, whereas 14 of them were done for consolidated ridge, six for unconsolidated ridge, three for surrounding level ice and one in the open water to determine the buoyancy load on the indentor. Both the structural tests and punch tests showed clearly that the ridge strength and load depend strongly on the consolidation.
analyzing ridge keel punch tests. In a punch test, a circular platen of consolidated layer is first cut free from the surrounding ice field. Thereafter, the ice is pushed vertically downwards with a cylindrical indentor to break the underlying keel. The measured load-displacement relationship can be used for the evaluation of the mechanical properties of rubble. Three ice sheets were created and used to build ridges, in which the ridge consolidation temperature and time were varied. All together 24 punch tests were carried out, whereas 14 of them were done for consolidated ridge, six for unconsolidated ridge, three for surrounding level ice and one in the open water to determine the buoyancy load on the indentor. Both the structural tests and punch tests showed clearly that the ridge strength and load depend strongly on the consolidation.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 26th International Conference on Port and Ocean Engineering under Arctic Conditions |
| Subtitle of host publication | POAC 2021 |
| Number of pages | 13 |
| Publication status | Published - 2021 |
| MoE publication type | A4 Article in a conference publication |
| Event | International Conference on Port and Ocean Engineering under Arctic Conditions - Virtual, Moscow, Russian Federation Duration: 14 Jun 2021 → 18 Jun 2021 Conference number: 26 |
Publication series
| Series | POAC Proceedings |
|---|---|
| ISSN | 0376-6756 |
Conference
| Conference | International Conference on Port and Ocean Engineering under Arctic Conditions |
|---|---|
| Abbreviated title | POAC 2021 |
| Country/Territory | Russian Federation |
| City | Moscow |
| Period | 14/06/21 → 18/06/21 |
Keywords
- ice load
- ridge loads
- punch tests
- offshore wind turbine
- ice rubble
- ridge keel
