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- W2077800826 abstract "The thermal expansion of rocks has customarily been measured at room pressure; it is typically irreversible after heating above room temperature and the coefficient of thermal expansion of a rock is usually much larger than the average coefficients for the minerals in the rock. We measured coefficients of thermal expansion of rocks under sufficient pressure that the strains were reversible; the coefficients obtained fell close to the theoretical bounds for polycrystalline aggregates calculated by Walsh. Thus, within the limit of assumption in the theory, Walsh's theoretical bounds gave a good estimate of the intrinsic thermal expansion of rocks. The thermal expansions were measured by strain gauges attached to copper-jacketed samples of granite, diabase, marble, limestone, dunite and quartzite. The temperature range was 2°–38° and confining pressure ranged up to 600 MPa. Confining pressure had a small effect as long as pressure was greater than some critical value which apparently was the minimum needed to prevent thermal cracking and other non-elastic effects. The critical pressure depended on rock type and on thermal history of a sample. We propose theoretical models to explain the effects of temperature on the opening of cracks at high confining pressure, and the propagation of open cracks at low pressure induced by thermal gradient or internal stresses." @default.
- W2077800826 created "2016-06-24" @default.
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- W2077800826 date "1979-08-01" @default.
- W2077800826 modified "2023-10-03" @default.
- W2077800826 title "Thermal expansion of rocks: some measurements at high pressure" @default.
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- W2077800826 doi "https://doi.org/10.1016/0040-1951(79)90143-4" @default.
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