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Mechanical Behavior and Damage Constitutive Model of Rock Subjected to Water-Weakening Effect and Uniaxial Loading

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Abstract

Water-weakening effect is one of the most important causes triggering large deformation and failure of soft-rock engineering; however, few studies have paid attention to damage evolution and constitutive relationship of rock in water-weakening process. In this paper, laboratory tests are first carried out to estimate the evolution of mechanical properties along with changes of immersion time for shale samples. Then with the aid of X-ray diffraction and scanning electron microscope, mechanism of parameter degradation for shale under immersion conditions is investigated from the microscopic perspective. Based on the generalized strain equivalent principle and the theory of statistical microscopic damage mechanics, a damage constitutive model of rock subjected to water-weakening effect and uniaxial loading is established by considering the influence of void-compression stage, and the proposed model is verified to be in good agreement with the experiment results. This paper provides an effective approach to analyze the constitutive relationship of rock subjected to water-weakening effect and uniaxial loading.

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Acknowledgements

The authors gratefully acknowledge the support by the National Key R&D Program of China (Grant no. 2016YFC0401802), the State Key Program of National Natural Science of China (Grant no. 51539002), the National Natural Science Foundation of China (nos. 51779249, 51209198, 51204158 and 51409265), the Natural Science Foundation of Hubei Province (Grant no. 2018CFB632) and the Natural Science Foundation of Zhejiang Province (Grant no. LY13E090003).

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Correspondence to Kang Bian.

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Bian, K., Liu, J., Zhang, W. et al. Mechanical Behavior and Damage Constitutive Model of Rock Subjected to Water-Weakening Effect and Uniaxial Loading. Rock Mech Rock Eng 52, 97–106 (2019). https://doi.org/10.1007/s00603-018-1580-4

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  • DOI: https://doi.org/10.1007/s00603-018-1580-4

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