Journal
ROCK MECHANICS AND ROCK ENGINEERING
Volume 50, Issue 1, Pages 89-112Publisher
SPRINGER WIEN
DOI: 10.1007/s00603-016-1085-y
Keywords
Jointed rock; Dynamic property; Cyclic loading; Joint geometry; Reduction model
Funding
- National Program on Key Basic Research Project [2015CB057903]
- National Natural Science Foundation of China [51679158]
- Program for New Century Excellent Talents in University [NCET-13-0382]
- Youth Science and Technology Fund of Sichuan Province [2014JQ0004]
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Intermittent jointed rocks, which exist in a myriad of engineering projects, are extraordinarily susceptible to cyclic loadings. Understanding the dynamic fatigue properties of jointed rocks is necessary for evaluating the stability of rock engineering structures. This study numerically investigated the influences of cyclic loading conditions (i.e., frequency, maximum stress and amplitude) and joint geometric configurations (i.e., dip angle, persistency and interspace) on the dynamic fatigue mechanisms of jointed rock models. A reduction model of stiffness and strength was first proposed, and then, sixteen cyclic uniaxial loading tests with distinct loading parameters and joint geometries were simulated. Our results indicate that the reduction model can effectively reproduce the hysteresis loops and the accumulative plastic deformation of jointed rocks in the cyclic process. Both the loading parameters and the joint geometries significantly affect the dynamic properties, including the irreversible strain, damage evolution, dynamic residual strength and fatigue life. Three failure modes of jointed rocks, which are principally controlled by joint geometries, occur in the simulations: splitting failure through the entire rock sample, sliding failure along joint planes and mixed failure, which are principally controlled by joint geometries. Furthermore, the progressive failure processes of the jointed rock samples are numerically observed, and the different loading stages can be distinguished by the relationship between the number of broken bonds and the axial stress.
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