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Water Content and Bedding Angle Effects on the Mechanical Properties and Micro-/Macro-Failure Mechanism of Phyllite

  • Research Article-Civil Engineering
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Abstract

The study of anisotropy and water degradation in phyllite is a prerequisite for excavation and support of phyllite tunnels. Previous studies have mostly analyzed the mechanical characteristics of phyllite under the action of water/laminae alone, but less research has been carried out on the macroscopic properties and microfracture evolution of phyllite under the action of coupled water-laminae. Therefore, the microstructure, mechanical behavior and fracture mode of phyllite were analyzed by polarized light and uniaxial experiments, and then SEM, acoustic emission (AE) and numerical tests of phyllite were carried out. The results indicate that (1) the elastic modulus of phyllite presents an asymmetric U-shape with bedding angle, with the maximum value of 0° and 90° and the minimum value of 60°. The peak strength shows two differentiation trends: U-shaped and nonlinear decreasing with bedding angle. (2) The peak strength and elastic modulus of phyllite are negatively correlated with water content. (3) The fracture mode of phyllite changes from compression shear failure to tensile failure with bedding angle. (4) The laminated structure and fish scale texture of phyllite tend to be discrete due to water erosion, which promotes the expansion of microcracks and weakens the mechanical parameters of the rock. (5) The change law of AE cumulative energy with bedding and water content is consistent with the change in macromechanical characteristics, which reveals the internal relationship between the progressive evolution of microcracks in rocks and macrofractures. The research results can provide an important reference for the construction scheme design, long-term stability, operation and maintenance of similar projects.

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Data Availability

All data used in this study are openly available from corresponding author upon request.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (NSFC, Grant Numbers 51774057 and 52074048).

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Authors and Affiliations

  1. School of Resources and Safety Engineering, Chongqing University, Chongqing, 400030, China

    Long-Hao Ma, Jie Chen, Chuang Zhang, Rong Liu & Song Ren

  2. State Key Laboratory for the Coal Mine Disaster Dynamics and Controls, Chongqing University, Chongqing, 400044, China

    Long-Hao Ma, Jie Chen, Chuang Zhang, Rong Liu & Song Ren

  3. School of Urban Construction, Yangtze University, Jingzhou, 434023, Hubei, China

    Yun-Feng Zhao

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  1. Long-Hao Ma
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Long-hao Ma, Jie Chen, Yun-Feng Zhao, Chuang Zhang, Rong Liu and Song Ren declare that they have no conflicts of interest.

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Ma, LH., Chen, J., Zhao, YF. et al. Water Content and Bedding Angle Effects on the Mechanical Properties and Micro-/Macro-Failure Mechanism of Phyllite. Arab J Sci Eng 47, 13151–13169 (2022). https://doi.org/10.1007/s13369-022-06716-6

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