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Abstract Combining technique of digital image processing and finite element software ANSYS，the CT image of freezing-thawing shale is processed；and the meso-structure image of shale is obtained. The law of temperature field of freezing-thawing shale is analyzed in negative temperature condition. Study results show that the digital image processing method can be used as a measurement tool to construct a digital representation for actual spatial distribution of different materials in shale. It not only can accurately describe the spatial distribution of shale damage but also can get the maximum use out of hidden information in CT image of shale. The meso-structure image is incorporated into finite element software ANSYS to achieve the goal of simulating temperature field law of freezing-thawing shale with consideration of the actual spatial distribution of meso-medium and initial shale damage. The following conclusion is drawn by analysis. The meso-structure determines the distribution of temperature field of freezing-thawing shale and also has an important influence on freezing-thawing damage process. The proposed approach can grope for the hazard reasons in view of meso-scale and provide a new way to research the inherent mechanisms of frost heave，thaw settlement and the consolidation of frozen ground.
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Received: 26 November 2006
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