An experiment on temperature variations in sandstone during biaxial loading |
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| Institution: | 1. Kamchatka Branch of the Geophysical Survey, Russian Academy of Sciences, bul’v. B. Piipa 9, Petropavlovsk-Kamchatskii, 683006, Russia;2. The Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, ul. B. Gruzinskaya 10/1, Moscow, 123242, Russia;3. Institute of Volcanology and Seismology, Far Eastern Division, Russian Academy of Sciences, bul’v. B. Piipa 9, Petropavlovsk-Kamchatskii, 683006, Russia;1. Department of Informatics and Statistics, Federal University of Santa Catarina (UFSC), Campus Reitor João David Ferreira Lima, Trindade, Florianópolis 88040-970, Brazil;2. Institute of Computing, University of Campinas (UNICAMP), Av. Albert Einstein, 1251, Cidade Universitária, Campinas 13083-852, Brazil;3. BRGM, BP 6009, 45060 Orléans Cedex 2, France;4. Informatics Institute, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves, 9500, Campus do Vale, Porto Alegre 91501-970, Brazil;5. CEA-DRT - LIG Laboratory, University of Grenoble Alpes, 110 Avenue de la Chimie, 38400 Saint-Martin d’Hères, France |
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| Abstract: | The temperature response to stress–strain variations in rock is useful in developing an understanding of the thermodynamic property of crust. In this study, the temperature of sandstone during loading was investigated using laboratory biaxial testing. By changing the loading patterns, the deformation of a specimen was controlled to produce two distinct modes of strain: volume strain only and shear strain only. These strain modes were produced separately such that the temperature variation associated with the different deformation modes could be analysed. Experimental results indicate that temperature, as a scalar quantity, is notably sensitive to rock deformation. In the case of the volume strain, the temperature variation is positively correlated with the variation in the bulk stress. The temperature rises with the increase in hydrostatic pressure, and vice versa. In the case of the shear strain, experimental results repeatedly show two characteristics: firstly, there appears obvious increase in temperature in the area of pure shear strain, which is most likely related to local plastic deformation; secondly, the temperature drops in the area of tension during loading, whereas the temperature rises within the area of compression. This is to say, the state of crustal stress–strain should be obtained through the measurement of rock temperature. |
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| Keywords: | Temperature response Stress–strain Volume deformation Pure shear Sandstone |
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