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Bearing Capacity Calculations for Piles in Permafrost

by V. R. Parameswaran, Natl Research Council of Canada, Div, of Building Research, Ottawa, Ont, Canada,



Document Type: Proceeding Paper

Part of: Cold Regions Engineering

Abstract:

Small-scale model piles frozen in various soils were tested at constant rates of displacement and constant load. The derived values were used to calculate the maximum allowable stress at the pile-soil interface based on: minimum or steady-state displacement rates observed in the constant-load creep tests, and time to failure, which is equal to the time to attain peak load in tests carried out under constant displacement rate and (for constant-load creep tests) time to the onset of tertiary or accelerating creep. The latter method, which applies S. S. Vyalov's equation to constant-load creep tests, gives the lowest value for allowable stress, based on a failure time of 25 years, and can provide a better margin of safety during the life of a structure founded in permafrost.

Subject Headings: Pile tests | Load tests | Creep | Maximum loads | Pile foundations | Permafrost | Load bearing capacity

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