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Assessment of cyclic deformation and critical stress amplitude of jointed rocks via cyclic triaxial testing

Journal of Rock Mechanics and Geotechnical Engineering 2023年第6期15卷 1370-1390页

作者： waranga habaraduwa peellage Behzad Fatahi Haleh Rasekh School of Civil and Environmental Engineering University of Technology SydneySydneyAustralia

Jointed rock specimens with a natural replicated joint surface oriented at a mean dip angle of 60were prepared,and a series of cyclic triaxial tests was performed at different confining pressures and cyclic deviatoric stress *** samples were subjected to 10,000 loading-unloading cycles with a frequency of 8 *** each level of confining pressure,the applied cyclic deviatoric stress amplitude was increased incrementally until excessive deformation of the jointed rock specimen was *** of the test results indicated that there existed a critical cyclic deviatoric stress amplitude(*** dynamic deviatoric stress)beyond which the jointed rock specimens *** measured critical dynamic deviatoric stress was less than the corresponding static deviatoric *** cyclic deviatoric stress amplitudes less than the critical dynamic deviatoric stress,minor cumulative residual axial strains were observed,resulting in hysteretic ***,for cyclic deviatoric stresses beyond the critical dynamic deviatoric stress,the plastic strains increased promptly,and the resilient moduli degraded rapidly during the initial loading *** triaxial test results showed that at higher confining pressures,the ultimate residual axial strain attained by the jointed rock specimen decreased,the steadystate dissipated energy density and steady-state damping ratio per load cycle decreased,while steadystate resilient moduli increased.

关键词： Cyclic triaxial test Jointed rock Joint surface Confining pressure Cyclic deviatoric stress amplitude Failure Residual deformation Dissipated energy

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