Macroscopic frost heave model based on segregation potential theory |
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Authors: | JI Zhichang XU Xueyan YU Linlin |
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Institution: | 1. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221008,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China 2. School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China |
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Abstract: | A macroscopic frost heave model with more clear parameters was established. Based on a porosity rate frost heave model and
segregation potential theory, a porosity rate function was deduced and introduced into the stress-strain relationship. Numerical
simulation was conducted and verified by frost heave tests. Results show that the porosity rate within the frozen fringe is
proportional to the square of temperature gradient and current porosity, and is also proportional to the exponential function
of applied pressure. The relative errors between the calculated and measured results of frost depth and frost heave are within
3% and 15% respectively, demonstrating that the temperature gradient, applied pressure and current porosity are the main influencing
factors, while temperature is just the constraint of frozen fringe. The improved model have meaningful and accessible parameters,
which can be used in engineering with good accuracy. |
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Keywords: | frost heave model porosity rate segregation potential frost heave test temperature gradient |
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