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Effects of shear rate on cyclic loading shear behaviour of rock joints under constant normal stiffness conditions

Journal Article


Abstract


  • The presence of joints and discontinuities within a rock

    mass can significantly affect its mechanical behaviour and

    therefore the stability of structures constructed at close

    proximity. Several studies have been carried out by previous

    researchers to understand the mechanical behaviour

    of joints under both constant normal load (CNL) conditions,

    in which the normal load remains unchanged during

    shearing, and constant normal stiffness (CNS) conditions to

    imitate the stiffness of the surrounding rock mass (Patton

    1966; Ladanyi and Archambault 1969; Barton 1973, 1976;

    Seidel and Haberfield 1995; Indraratna and Haque 2000;

    Buzzi et al. 2008). The importance of CNS conditions to

    simulate the actual shear behaviour of rock joints in the

    field has been described by Johnston and Lam (1989),

    Skinas et al. (1990) and Indraratna et al. (1998).

    The above-mentioned studies focussed only on the

    monotonic loading shear behaviour of rock joints. The

    effects of cyclic loading on the shear behaviour of rock

    joints in earthquakes and blasting were investigated in

    detail by Plesha (1987), Hutson and Dowding (1990), Lee

    et al. (2001), Stupkiewicz and Mro´z (2001), Grasselli and

    Egger (2003), Jafari et al. (2003) and Belem et al. (2009).

    As the shear rate might vary depending on the source of

    the load and rock media, Crawford and Curran (1981)

    carried out a series of experiments on artificial rock joints

    with various shear rates and normal stresses under CNL

    conditions. Based on the measured data, they concluded

    that the shear rate may influence the shear strength of hard

    and soft rock joints differently. In another study, Jafari

    et al. (2004) verified the results of Crawford and Curran

    (1981) for shear rates between 0.05 and 0.4 mm/min under

    monotonic loading.

    None of these researchers investigated the effects of

    shear rate on the cyclic loading shear behaviour of rock

    joints under CNS conditions, which is a critical issue in

    stability analysis of underground structures subjected to

    seismic events. Accordingly, three sets of cyclic loading

    shear tests with various shear rates and initial normal

    stresses were conducted on artificial triangular joints under

    CNS conditions. In this study, the experimental data are

    critically analysed.

UOW Authors


  •   Aziz, Naj I.
  •   Mirzaghorbanali, Ali (external author)
  •   Nemcik, Jan A.

Publication Date


  • 2014

Citation


  • Mirzaghorbanali, A., Nemcik, J. & Aziz, N. (2014). Effects of shear rate on cyclic loading shear behaviour of rock joints under constant normal stiffness conditions. Rock Mechanics and Rock Engineering, 47 (5), 1931-1938.

Scopus Eid


  • 2-s2.0-84879878436

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2267

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 1931

End Page


  • 1938

Volume


  • 47

Issue


  • 5

Abstract


  • The presence of joints and discontinuities within a rock

    mass can significantly affect its mechanical behaviour and

    therefore the stability of structures constructed at close

    proximity. Several studies have been carried out by previous

    researchers to understand the mechanical behaviour

    of joints under both constant normal load (CNL) conditions,

    in which the normal load remains unchanged during

    shearing, and constant normal stiffness (CNS) conditions to

    imitate the stiffness of the surrounding rock mass (Patton

    1966; Ladanyi and Archambault 1969; Barton 1973, 1976;

    Seidel and Haberfield 1995; Indraratna and Haque 2000;

    Buzzi et al. 2008). The importance of CNS conditions to

    simulate the actual shear behaviour of rock joints in the

    field has been described by Johnston and Lam (1989),

    Skinas et al. (1990) and Indraratna et al. (1998).

    The above-mentioned studies focussed only on the

    monotonic loading shear behaviour of rock joints. The

    effects of cyclic loading on the shear behaviour of rock

    joints in earthquakes and blasting were investigated in

    detail by Plesha (1987), Hutson and Dowding (1990), Lee

    et al. (2001), Stupkiewicz and Mro´z (2001), Grasselli and

    Egger (2003), Jafari et al. (2003) and Belem et al. (2009).

    As the shear rate might vary depending on the source of

    the load and rock media, Crawford and Curran (1981)

    carried out a series of experiments on artificial rock joints

    with various shear rates and normal stresses under CNL

    conditions. Based on the measured data, they concluded

    that the shear rate may influence the shear strength of hard

    and soft rock joints differently. In another study, Jafari

    et al. (2004) verified the results of Crawford and Curran

    (1981) for shear rates between 0.05 and 0.4 mm/min under

    monotonic loading.

    None of these researchers investigated the effects of

    shear rate on the cyclic loading shear behaviour of rock

    joints under CNS conditions, which is a critical issue in

    stability analysis of underground structures subjected to

    seismic events. Accordingly, three sets of cyclic loading

    shear tests with various shear rates and initial normal

    stresses were conducted on artificial triangular joints under

    CNS conditions. In this study, the experimental data are

    critically analysed.

UOW Authors


  •   Aziz, Naj I.
  •   Mirzaghorbanali, Ali (external author)
  •   Nemcik, Jan A.

Publication Date


  • 2014

Citation


  • Mirzaghorbanali, A., Nemcik, J. & Aziz, N. (2014). Effects of shear rate on cyclic loading shear behaviour of rock joints under constant normal stiffness conditions. Rock Mechanics and Rock Engineering, 47 (5), 1931-1938.

Scopus Eid


  • 2-s2.0-84879878436

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2267

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 1931

End Page


  • 1938

Volume


  • 47

Issue


  • 5