Title: CONSTITUTIVE MODEL OF WATER-SATURATED MARBLE UNDER COUPLING EFFECTS OF UNIAXIAL IMPACT COMPRESSIVE LOADING AND LOW-TEMPERATURE |
Authors: Li Junzhe, Zhang Guang, Liu Mingze, Hu Shaohua and Zhou Xinlong |
DOI: 10.13168/AGG.2020.0011 |
Journal: Acta Geodynamica et Geomaterialia, Vol. 17, No. 2 (198), Prague 2020 |
Full Text: PDF file (0.5 MB) |
Keywords: Damage constitutive model, impact load, frozen rock, component combination, Weibull distribution
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Abstract: The study of the mechanical properties of frozen rock is a basic problem that humans have to face in artificial low-temperature rock engineering and cold region rock engineering. There are few literatures on the dynamic constitutive models of frozen rocks under low-temperature gradients at home and abroad. In this paper, the constitutive model of water-saturated marble under the coupling effects of uniaxial impact compressive load and low-temperature is studied by theoretical analysis and experimental verification. Based on the theory of mechanical element combination, a rock constitutive model considering strain rate effect, damage softening effect and low-temperature effect is established, and the model parameters are determined by fitting method. The dynamic stress-strain curve of water-saturated marble at -30 ℃ is predicted. The predicted results are in good agreement with the experimental results and the concordance correlation coefficient is 0.984092. The relevant results of this paper can provide a theoretical reference for the excavation and protection of rock engineering under negative temperature. |