低温で熱サイクルを受ける岩石の弾性定数について

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The dynamic moduli of three kinds of dry and saturated rocks were determined during thermal cycling between 110K and 370K at a slow heating rate (0.5K/min.). In the dry condition,the moduli of both Murata basalt and Ogino tuff increased linearly with decreasing temperature. The temperature coefficients of bulk and shear moduli were expected to be the same as those free from the effect of microcracks. On the other hand,the temperature coefficients of the bulk and shear moduli of Westerly granite were affected by both thermal cracking and the opening and closure of the pre-existing microcracks. They showed a sharp decrease when the granite was heated above 330K in the first cycle. A permanent decrease in the moduli was observed after both heating and cooling. During the second thermal cycling where few cracking presumably occurred, the coefficients of the moduli were almost positive. In the saturated condition,the moduli of the basalt,tuff,and granite increased rapidly when the rocks were cooled below room temperature. These changes coincided with those observed in thermal expansion down to 230K. Below 230K,the moduli,however,gradually increased with no change in thermal expansion. These observations suggest that the increase in the moduli is due to freezing of water within pores and microcracks between 270K and 230K,and that stiffening of absorbed water in the surface of pores and microcracks has an effect on the increase in the moduli below 230K.
社団法人日本材料学会の論文
1986-11-15

低温で熱サイクルを受ける岩石の弾性定数について

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