Determine Forces Required to Uplift Marine Piles due to Water Level Changes.

All previous work on uplifting ice forces, theoretical as well as experimental, has focused on the forces necessary to extract a pile from an ice sheet in one pull-out. In the present test series, the piles were cycled up and down in hundreds of cycles in order to stimulate natural conditions throug...

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Bibliographic Details
Main Author: Christensen,F T
Other Authors: TECHNICAL UNIV OF DENMARK LYNGBY INST OF HYDRODYNAMICS AND HYDRAULIC ENGINEERING
Format: Text
Language:English
Published: 1984
Subjects:
Snow
Ice and Permafrost
Structural Engineering and Building Technology
*PILE STRUCTURES
INTERACTIONS
WATER
LOADS(FORCES)
CRACKS
DISPLACEMENT
CYCLES
WINTER
ICE
SHEETS
FLEXURAL STRENGTH
LEVEL(QUANTITY)
FORMULAS(MATHEMATICS)
Ice jacking
Uplift
Ice
Ice Sheet
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA159350
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA159350
Description
Summary:All previous work on uplifting ice forces, theoretical as well as experimental, has focused on the forces necessary to extract a pile from an ice sheet in one pull-out. In the present test series, the piles were cycled up and down in hundreds of cycles in order to stimulate natural conditions throughout a winter. The results of this program may be summarized as follows: a) Evaluation of theoretical formulae for predicting the ice-induced vertical forces in a pile; b) Evaluation of theoretical formulae for predicting the ice-induced vertical forces in an interacting group of piles; c) Laboratory verification of successive processes responsible for step-wise jacking of piles by ice; d) Establishment of a theory on the refreezing of cracks, and derivation of an empirical formula to predict the relative flexural strength of a particularly refrozen crack.

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