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| | Abstract | | The thermal expansion model proposed by the author (Kitsunezaki, 2013) is reorganized to clarify physical base and to extend its applicability. The base of the model is elastic deformation due to the nucleus of dilatation (ND) in a semi-infinite homogeneous isotropic solid. In the thermal expansion model, the ND corresponds to a minute domain of high temperature. Effects of a high temperature domain with any shape are obtained by integrating those of the ND. The effects actually mean displacements and gravity change on the free plane surface corresponding to the ground surface. A high temperature domain with arbitrary shape does not cause gravity change except the free-air effect, because the ND does not cause such gravity change. Actual grounds may be regarded as water-saturated porous media. Thermal expansion coefficient of water is considerably larger than that of solid. Thermal expansion of pore water causes negative gravity change, which is added to the free air effect so as to amplify the total gravity reduction in some degree. This effect of pore water was estimated, assuming the pores to be in open condition. |
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