A method for frost jacking prediction of single pile in permafrost

In this paper, a model is proposed to simulate frost jacking performances of a pile foundation within an axisymmetric pile–soil system through a coupling strategy. We consider three diversified stages for frost heave of adjacent foundation soil below freezing point, where mathematical expressions fo...

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Bibliographic Details
Published in:Acta geotechnica 2020-02, Vol.15 (2), p.455-470
Main Authors: Liu, Jiankun, Wang, Tengfei, Tai, Bowen, Lv, Peng
Format: Article
Language:English
Subjects:
Bridge foundations
Bridges
Complex Fluids and Microfluidics
Computer applications
Computer simulation
Engineering
Foundations
Freezing
Freezing point
Frost
Frost heaving
Frozen ground
Geoengineering
Geotechnical Engineering & Applied Earth Sciences
Hydraulics
Interactions
Mathematical models
Melting points
Moisture content
Permafrost
Pile foundations
Piles
Porosity
Pressure effects
Research Paper
Soft and Granular Matter
Soil
Soil moisture
Soil porosity
Soil Science & Conservation
Soil temperature
Solid Mechanics
Temperature
Temperature effects
Volumetric strain
Water content
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Summary:In this paper, a model is proposed to simulate frost jacking performances of a pile foundation within an axisymmetric pile–soil system through a coupling strategy. We consider three diversified stages for frost heave of adjacent foundation soil below freezing point, where mathematical expressions for the volumetric strain are given in terms of volumetric ice content, negative temperature and porosity. A modified strain-softening model characterizing frozen soil–pile interactions is established based on experimental results, taking into account the effects of normal pressure, negative temperature and moisture content. The proposed computational approach is then illuminated and validated via the numerical example of a simplified bridge pile foundation under natural permafrost condition. Variation of temperature regime, volumetric ice content, displacement and stress over time is analyzed. This model can be further applied to evaluating effects of different countermeasures that mitigate frost jacking hazard of single pile subjected to cold climate.
ISSN:1861-1125
1861-1133
DOI:10.1007/s11440-018-0711-0