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Critical shear strain and sliding potential of rock joint under cyclic loading

Journal Article


Abstract


  • A new concept of critical shear strain ����critical of rock joint under cyclic loading is presented, and the role of ����critical in evaluating the sliding potential of rock joint is highlighted. A series of cyclic triaxial tests was conducted on a cylindrical rock joint specimen with a replicated rough surface representing a joint roughness coefficient JRC value of 12.6 oriented at 60�� with respect to the horizontal plane. The experimental results indicate that the onset of instability of rock joint is suppressed with increase in confining pressure and number of loading cycles N until the normalized shear deformation increases beyond a threshold value of ����critical. Generally, the critical strain of most rock types is considered in the proximity of 1% under small strain conditions [36���37], however, in this study, the critical strain concept is extended to the domain of rock joints, and a semi-empirical model to more rigorously quantify the critical shear strain (����critical) of rock joint is suggested considering the effect of joint roughness coefficient JRC, cyclic loading amplitude, and the number of loading cycles N. Also, a rational classification of Joint Sliding Potential (JSP) based on the ����critical and normalized total shear strain ����N of rock joint is proposed to characterize the cyclic loading induced sliding instability of a rock discontinuity.

Publication Date


  • 2022

Citation


  • Soomro, M. H. A. A., Indraratna, B., & Karekal, S. (2022). Critical shear strain and sliding potential of rock joint under cyclic loading. Transportation Geotechnics, 32. doi:10.1016/j.trgeo.2021.100708

Scopus Eid


  • 2-s2.0-85121337904

Volume


  • 32

Issue


Place Of Publication


Abstract


  • A new concept of critical shear strain ����critical of rock joint under cyclic loading is presented, and the role of ����critical in evaluating the sliding potential of rock joint is highlighted. A series of cyclic triaxial tests was conducted on a cylindrical rock joint specimen with a replicated rough surface representing a joint roughness coefficient JRC value of 12.6 oriented at 60�� with respect to the horizontal plane. The experimental results indicate that the onset of instability of rock joint is suppressed with increase in confining pressure and number of loading cycles N until the normalized shear deformation increases beyond a threshold value of ����critical. Generally, the critical strain of most rock types is considered in the proximity of 1% under small strain conditions [36���37], however, in this study, the critical strain concept is extended to the domain of rock joints, and a semi-empirical model to more rigorously quantify the critical shear strain (����critical) of rock joint is suggested considering the effect of joint roughness coefficient JRC, cyclic loading amplitude, and the number of loading cycles N. Also, a rational classification of Joint Sliding Potential (JSP) based on the ����critical and normalized total shear strain ����N of rock joint is proposed to characterize the cyclic loading induced sliding instability of a rock discontinuity.

Publication Date


  • 2022

Citation


  • Soomro, M. H. A. A., Indraratna, B., & Karekal, S. (2022). Critical shear strain and sliding potential of rock joint under cyclic loading. Transportation Geotechnics, 32. doi:10.1016/j.trgeo.2021.100708

Scopus Eid


  • 2-s2.0-85121337904

Volume


  • 32

Issue


Place Of Publication