Scale-model ridges and interaction with narrow structures, Part 3 Analysis of Ridge Keel Punch Tests: POAC 2021

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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.
Original languageEnglish
Title of host publicationProceedings of the 26th International Conference on Port and Ocean Engineering under Arctic Conditions
Subtitle of host publicationPOAC 2021
Number of pages13
Publication statusPublished - 2021
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Port and Ocean Engineering under Arctic Conditions - Virtual, Moscow, Russian Federation
Duration: 14 Jun 202118 Jun 2021
Conference number: 26

Publication series

SeriesPOAC Proceedings
ISSN0376-6756

Conference

ConferenceInternational Conference on Port and Ocean Engineering under Arctic Conditions
Abbreviated titlePOAC 2021
Country/TerritoryRussian Federation
CityMoscow
Period14/06/2118/06/21

Keywords

  • ice load
  • ridge loads
  • punch tests
  • offshore wind turbine
  • ice rubble
  • ridge keel

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