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Influence of Intermediate Principal Stress on Mechanical and Failure Properties of Anisotropic Sandstone

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Abstract

Since an increasing number of rock engineering structures are constructed in the stratified rock mass, a comprehensive understanding of the mechanical properties of anisotropic rock is crucial for the stability evaluation of these structures. In this study, the combined influences of the dip angle of the bedding plane and intermediate principal stress on the strength and failure behavior of anisotropic rock are experimentally investigated. True triaxial compression tests on a sandstone possessing seven different bedding plane angles (i.e., 0°, 15°, 30°, 45°, 60°, 75°, and 90°) are conducted under six different intermediate principal stresses (i.e., 10 MPa, 60 MPa, 100 MPa, 130 MPa, 160 MPa, and 190 MPa). The effects of intermediate principal stress and bedding plane angle on the stress–strain curve, Young's modulus, strength, and failure mode of the rock are soundly examined and discussed. The results show that both intermediate principal stress and bedding plane angle have a large influence on the deformation properties of the rock. In addition, the peak strength exhibits a typical U-shaped variation with increasing bedding plane angle under low intermediate principal stress condition, and the U-shaped behavior gradually diminishes with the increase in intermediate principal stress. Multiple failure planes can be observed after the failure of the rock specimens, showing asymmetric V-shaped patterns. The failure angle of the tested rock is found to generally increase as the applied intermediate principal stress gradually increases. The results in the present study deepen our understanding of the strength and failure behavior of anisotropic rock under true triaxial loading conditions.

Highlights

  • Peak strength shows a U-shaped variation with increasing bedding plane angle at small σ2.

  • U-shaped behavior of rock strength diminishes with increasing intermediate principal stress.

  • Multiple asymmetric V-shaped failure patterns are observed after the failure of the rock specimen.

  • Failure angle exhibits an increasing trend as intermediate principal stress gradually increases.

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Data Availability

Data are available from the corresponding author on reasonable request.

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Acknowledgements

The research work presented in this paper is in part supported by the National Key Research and Development Plan (Grant No. 2022YFC2905700), Key Project of National Natural Science Foundation of China (Grant No. 52130403), Natural Science Foundation of Anhui Province (Grant No. 2208085ME120), and Key Research and Development Plan of Anhui Province (Grant No. 2022m07020001). The authors are grateful to these financial supports.

Funding

National Key Research and Development Plan, 2022YFC2905700, Jun Peng, National Natural Science Foundation of China, 52130403, Jun Peng, Natural Science Foundation of Anhui Province, 2208085ME120, Jun Peng, Key Research and Development Plan of Anhui Province, 2022m07020001, Jun Peng.

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Gao, D., Peng, J., Kwok, F.C.Y. et al. Influence of Intermediate Principal Stress on Mechanical and Failure Properties of Anisotropic Sandstone. Rock Mech Rock Eng (2024). https://doi.org/10.1007/s00603-024-03986-4

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