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Macroscopic frost heave model based on segregation potential theory
Authors:JI Zhichang  XU Xueyan  YU Linlin
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
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.
Keywords:frost heave model  porosity rate  segregation potential  frost heave test  temperature gradient
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