Abstract
To avoid the complexity of modeling frost heave from microscope, porosity rate function has been used in predication of frost heave phenomenon. The approach explored in this paper is based on frost heave tests and the concept of the segregated potential which has been widely accepted by researchers in order to find the proper form of the porosity rate function. In the frozen fringe the porosity rate function was derived: <i>n<sup>•</sup>=Be<sup>(-aP<sub>e</sub>)</sup></i> (grad<i>T</i>)<sup>2</sup> (1<i>-n</i>) , (<i>T<sub>s</sub><T<T<sub>i</sub></i>). It showed that the primary influencing factor affected porosity rate is temperature gradient rather than temperature, it is more reasonable to consider the influence of the temperature gradient in the frozen fringe rather than in the whole column. Then development of the constitutive model is outlined. Five freezing tests were carried out to verify the model, and the comparison between test results and analog results shows that the modified model is efficient for the prediction of frost heave, and it can be used in engineering practice.
Published Version
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