Failure characteristics of jointed rock-like material containing multi-joints under a compressive-shear test: Experimental and numerical analyses

R. H. Cao, P. Cao, H. Lin, G. W. Ma, C. Y. Zhang, C. Jiang

    Research output: Contribution to journalArticle

    Abstract

    Extensive efforts have been made to gain a better understanding of the failure behaviour of rocks and rock-like materials, but crack propagation and failure processes under compressive-shear loading have not yet been comprehensively investigated. To address this area of research, the peak shear strengths (τ) and failure processes of specimens with multiple joints are studied by lab testing and particle flow code (PFC2D). Four types of failure modes are observed: (a) shear failure through a plane (Mode-I), (b) intact shear failure (Mode-II), (c) oblique shear crack connection failure (Mode-III), and (d) stepped path failure (Mode-IV). The failure mode gradually transformed to Mode-III as α (joint inclination angle) increases from 0° to 90° in the specimens. In addition, with increasing joint distance (d) in the specimens, the failure mode changes to Mode-II. As the non-overlapping length between joints (c) in the specimens increases, the failure mode changes to Mode-IV. The joint geometry has a major influence on the shear strength of the jointed specimens. The peak shear strength of specimens with different joint inclination angles is obtained when α = 45°. Additionally, the peak shear strength increases as the joint distance (d) and non-overlapping length (c) increase.

    LanguageEnglish
    Pages784-798
    Number of pages15
    JournalArchives of Civil and Mechanical Engineering
    Volume18
    Issue number3
    DOIs
    StatePublished - 1 Jul 2018

    Fingerprint

    Failure modes
    Rocks
    Shear strength
    Crack propagation
    Cracks
    Geometry
    Testing

    Cite this

    @article{14e7dc0080994b34bdaac0bab9917060,
    title = "Failure characteristics of jointed rock-like material containing multi-joints under a compressive-shear test: Experimental and numerical analyses",
    abstract = "Extensive efforts have been made to gain a better understanding of the failure behaviour of rocks and rock-like materials, but crack propagation and failure processes under compressive-shear loading have not yet been comprehensively investigated. To address this area of research, the peak shear strengths (τ) and failure processes of specimens with multiple joints are studied by lab testing and particle flow code (PFC2D). Four types of failure modes are observed: (a) shear failure through a plane (Mode-I), (b) intact shear failure (Mode-II), (c) oblique shear crack connection failure (Mode-III), and (d) stepped path failure (Mode-IV). The failure mode gradually transformed to Mode-III as α (joint inclination angle) increases from 0° to 90° in the specimens. In addition, with increasing joint distance (d) in the specimens, the failure mode changes to Mode-II. As the non-overlapping length between joints (c) in the specimens increases, the failure mode changes to Mode-IV. The joint geometry has a major influence on the shear strength of the jointed specimens. The peak shear strength of specimens with different joint inclination angles is obtained when α = 45°. Additionally, the peak shear strength increases as the joint distance (d) and non-overlapping length (c) increase.",
    keywords = "Coalescence, Compressive-shear loading, Failure loads, Intermittent joints, Rock-like material",
    author = "Cao, {R. H.} and P. Cao and H. Lin and Ma, {G. W.} and Zhang, {C. Y.} and C. Jiang",
    year = "2018",
    month = "7",
    day = "1",
    doi = "10.1016/j.acme.2017.12.003",
    language = "English",
    volume = "18",
    pages = "784--798",
    journal = "Archives of Civil and Mechanical Engineering",
    issn = "1644-9665",
    number = "3",

    }

    Failure characteristics of jointed rock-like material containing multi-joints under a compressive-shear test : Experimental and numerical analyses. / Cao, R. H.; Cao, P.; Lin, H.; Ma, G. W.; Zhang, C. Y.; Jiang, C.

    In: Archives of Civil and Mechanical Engineering, Vol. 18, No. 3, 01.07.2018, p. 784-798.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Failure characteristics of jointed rock-like material containing multi-joints under a compressive-shear test

    T2 - Archives of Civil and Mechanical Engineering

    AU - Cao,R. H.

    AU - Cao,P.

    AU - Lin,H.

    AU - Ma,G. W.

    AU - Zhang,C. Y.

    AU - Jiang,C.

    PY - 2018/7/1

    Y1 - 2018/7/1

    N2 - Extensive efforts have been made to gain a better understanding of the failure behaviour of rocks and rock-like materials, but crack propagation and failure processes under compressive-shear loading have not yet been comprehensively investigated. To address this area of research, the peak shear strengths (τ) and failure processes of specimens with multiple joints are studied by lab testing and particle flow code (PFC2D). Four types of failure modes are observed: (a) shear failure through a plane (Mode-I), (b) intact shear failure (Mode-II), (c) oblique shear crack connection failure (Mode-III), and (d) stepped path failure (Mode-IV). The failure mode gradually transformed to Mode-III as α (joint inclination angle) increases from 0° to 90° in the specimens. In addition, with increasing joint distance (d) in the specimens, the failure mode changes to Mode-II. As the non-overlapping length between joints (c) in the specimens increases, the failure mode changes to Mode-IV. The joint geometry has a major influence on the shear strength of the jointed specimens. The peak shear strength of specimens with different joint inclination angles is obtained when α = 45°. Additionally, the peak shear strength increases as the joint distance (d) and non-overlapping length (c) increase.

    AB - Extensive efforts have been made to gain a better understanding of the failure behaviour of rocks and rock-like materials, but crack propagation and failure processes under compressive-shear loading have not yet been comprehensively investigated. To address this area of research, the peak shear strengths (τ) and failure processes of specimens with multiple joints are studied by lab testing and particle flow code (PFC2D). Four types of failure modes are observed: (a) shear failure through a plane (Mode-I), (b) intact shear failure (Mode-II), (c) oblique shear crack connection failure (Mode-III), and (d) stepped path failure (Mode-IV). The failure mode gradually transformed to Mode-III as α (joint inclination angle) increases from 0° to 90° in the specimens. In addition, with increasing joint distance (d) in the specimens, the failure mode changes to Mode-II. As the non-overlapping length between joints (c) in the specimens increases, the failure mode changes to Mode-IV. The joint geometry has a major influence on the shear strength of the jointed specimens. The peak shear strength of specimens with different joint inclination angles is obtained when α = 45°. Additionally, the peak shear strength increases as the joint distance (d) and non-overlapping length (c) increase.

    KW - Coalescence

    KW - Compressive-shear loading

    KW - Failure loads

    KW - Intermittent joints

    KW - Rock-like material

    UR - http://www.scopus.com/inward/record.url?scp=85040071349&partnerID=8YFLogxK

    U2 - 10.1016/j.acme.2017.12.003

    DO - 10.1016/j.acme.2017.12.003

    M3 - Article

    VL - 18

    SP - 784

    EP - 798

    JO - Archives of Civil and Mechanical Engineering

    JF - Archives of Civil and Mechanical Engineering

    SN - 1644-9665

    IS - 3

    ER -