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Deformation and Failure Response Pattern of Schistosed Surrounding Rock to Its Anisotropic Properties

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Abstract

The anisotropy of schist usually has a complex influence on stability of tunnel surrounding rock. In this study, the schist anisotropy and its variation with the confining pressure are analyzed by the triaxial compression test. Then, geological models of tunnel under typical schistose angles α are established based on the highway tunnel project from Shiyan City to Fangxian County in China. Furthermore, the anisotropic failure mechanism, plastic zone distribution and displacement distribution of surrounding rock are investigated to understand its deformation and failure response pattern to the buried depth of tunnel and variable anisotropy. The results show that increased confining pressure weakens deformation anisotropy and weakly strengthens strength anisotropy of the schist. As the buried depth of tunnel changes from 60 to 140 m, the plastic morphology of surrounding rock with α = 0° presents a similar oval and it has a horizontal development trend. When α = 45°, it shows a spiral sector which has oblique extension as well as the increased angle θ between the long and short axis. While a cap shape with vertical development trend when α = 90°. With the weakening deformation anisotropy of surrounding rock, the anisotropic influence coefficient \(\gamma_{1}\) decreases gradually, indicating that schistose plane engenders a diminishing effect on the anisotropic deformation of surrounding rock as buried depth of tunnel increases.

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Acknowledgements

This research is financially supported by the Nanhu Scholars Program of Xinyang Normal University and the Natural Science Foundation of China (Grant No. 41807240).

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Authors and Affiliations

  1. Faculty of Architecture and Civil Engineering, Xinyang Normal University, Xinyang, 464000, China

    Xiaomeng Yin & Bo Feng

  2. Faculty of Engineering, China University of Geosciences, Wuhan, 430074, China

    E-chuan Yan

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  1. Xiaomeng Yin
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  2. E-chuan Yan
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  3. Bo Feng
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Correspondence to Xiaomeng Yin.

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Yin, X., Yan, Ec. & Feng, B. Deformation and Failure Response Pattern of Schistosed Surrounding Rock to Its Anisotropic Properties. Geotech Geol Eng 37, 5131–5146 (2019). https://doi.org/10.1007/s10706-019-00967-1

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