Abstract
Uniaxial compression tests on sandstone samples with five different sizes after high temperature processes were performed in order to investigate the size effect and its evolution. The test results show that the density, longitudinal wave velocity, peak strength, average modulus and secant modulus of sandstone decrease with the increase of temperature, however, peak strain increases gradually. With the increase of ratio of height to diameter, peak strength of sandstone decreases, which has an obvious size effect. A new theoretical model of size effect of sandstone material considering the influence of temperature is put forward, and with the increase of temperature, the size effect is more apparent. The threshold decreases gradually with the increase of temperature, and the deviations of the experimental values and the theoretical values are between 0.44% and 6.06%, which shows quite a credibility of the theoretical model.
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Foundation item: Project(2013CB036003) supported by the National Key Basic Research Program of China, Projects(51374198, 51134001) supported by the National Natural Science Foundation of China, Project(CXZZ13_0935) supported by the Jiangsu Province Ordinary College Graduate Research Innovative Program, China
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Su, Hj., Jing, Hw., Mao, Xb. et al. Size effect of sandstone after high temperature under uniaxial compression. J. Cent. South Univ. 22, 1901–1908 (2015). https://doi.org/10.1007/s11771-015-2709-1
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DOI: https://doi.org/10.1007/s11771-015-2709-1