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Scale Effects on Shear Strength of Rough Rock Joints Caused by Normal Stress Conditions

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  • Jiayi Shen

    (Institute of Port, Coastal and Offshore Engineering, Zhejiang University, Hangzhou 310015, China
    Key Laboratory of Offshore Geotechnics and Material of Zhejiang Province, Zhejiang University, Hangzhou 310058, China)

  • Chenhao Sun

    (Institute of Port, Coastal and Offshore Engineering, Zhejiang University, Hangzhou 310015, China)

  • Huajie Huang

    (Institute of Port, Coastal and Offshore Engineering, Zhejiang University, Hangzhou 310015, China)

  • Jiawang Chen

    (Hainan Institute, Zhejiang University, Sanya 572025, China)

  • Chuangzhou Wu

    (Institute of Port, Coastal and Offshore Engineering, Zhejiang University, Hangzhou 310015, China
    Key Laboratory of Offshore Geotechnics and Material of Zhejiang Province, Zhejiang University, Hangzhou 310058, China)

Abstract

Scale effects on the mechanical behavior of rock joints have been extensively studied in rocks and rock-like materials. However, limited attention has been paid to understanding scale effects on the shear strength of rock joints in relation to normal stress σ n applied to rock samples under direct shear tests. In this research, a two-dimensional particle flow code (PFC2D) is adopted to build a synthetic sandstone rock model with a standard joint roughness coefficient (JRC) profile. The manufactured rock model, which is adjusted by the experiment data and tested by the empirical Barton’s shear strength criterion, is then used to research scale effects on the shear strength of rock joints caused by normal stresses. It is found that the failure type can be affected by JRC and σ n . Therefore, a scale effect index (SEI) that is equal to JRC plus two times σ n (MPa) is proposed to identify the types of shear failure. Overall, shearing off asperities is the main failure mechanism for rock samples with SEI > 14, which leads to negative scale effects. It is also found that the degree of scale effects on the shear strength of rock joints is more obvious at low normal stress conditions, where σ n < 2 MPa.

Suggested Citation

  • Jiayi Shen & Chenhao Sun & Huajie Huang & Jiawang Chen & Chuangzhou Wu, 2023. "Scale Effects on Shear Strength of Rough Rock Joints Caused by Normal Stress Conditions," Sustainability, MDPI, vol. 15(9), pages 1-14, May.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:9:p:7520-:d:1139116
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    References listed on IDEAS

    as
    1. Shuai Li & Qi Huang & Boyi Hu & Jilong Pan & Junyu Chen & Jianguo Yang & Xinghui Zhou & Xinmin Wang & Haoxuan Yu, 2023. "Mining Method Optimization of Difficult-to-Mine Complicated Orebody Using Pythagorean Fuzzy Sets and TOPSIS Method," Sustainability, MDPI, vol. 15(4), pages 1-20, February.
    2. Yong Luo & Yakun Wang & Heng Guo & Xiaobo Liu & Yihui Luo & Yanan Liu, 2022. "Relationship between Joint Roughness Coefficient and Statistical Roughness Parameters and Its Sensitivity to Sampling Interval," Sustainability, MDPI, vol. 14(20), pages 1-23, October.
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