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| FATIGUE MECHANICAL BEHAVIOR OF GRANITE SUBJECTED TO CYCLIC LOAD AND ITS CONSTITUTIVE MODEL |
| WANG Zhechao，ZHAO Jiangang，LI Shucai，XUE Yiguo，ZHANG Qingsong，JIANG Yanyan |
| (Geotechnical and Structural Engineering Research Center，Shandong University，Jinan，Shandong 250061，China) |
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Abstract It is important to investigate the mechanical behavior of rock subjected to cyclic loading for both the basic theory of rock mechanics and the construction of geotechnical facilities. A series of triaxial compression tests under cyclic loading were performed to study the fatigue behavior of granite；and hereby a constitutive model was proposed to describe its fatigue behavior. In the tests，the following conclusions can be drawn. (1) The relation between residual strain and cycle number is influenced by the volumetric deformation behavior of granite，and so the relation between deformation modulus and cycle number is. (2) The fatigue behavior of granite could be divided into three domains in the stress-strain space，and the micro mechanism in one domain is different from that in another domain. (3) The threshold for fatigue failure of granite could be the peak deviatoric stress corresponding to the point transferring from volumetric contraction to volumetric dilation. (4) The potential of fatigue deformation is different from that of monotonic plastic deformation，while the granite exhibits a higher resistance to volumetric deformation under cyclic loading than that under monotonic plastic loading. (5) An internal variable fatigue constitutive model was proposed for the rock；and the fact that the predicted fatigue behavior is consistent with that observed in tests，so as to show that the constitutive model is capable of describing the fatigue behavior of rocks.
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Received: 15 March 2012
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2012, Vol. 31 
