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| Experimental study on effect of cyclic stress history on dynamic deformation of rockfill materials |
| ZHANG Lingkai,TANG Xinjun*,WANG Jianxiang |
| College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China |
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Abstract In order to study the influence of cyclic stress history on the deformation characteristics of rockfill materials, a series of tests were performed on rockfill materials under different stress paths by using the triaxial apparatus. The research is focused on the influence of the cyclic stress history on vo-lumetric strain and deviatoric strain. The experimental results show that the deformation is reduced after the cyclic stress history, which means that the ability to resist the deformation of rockfill materials is improved. Through the analysis and comparisons of the deformation of rockfill materials, the stress paths have less influence on the amplitude of resistance to deformation, and the influence of the confining pressure, the stress ratio and the magnitude of the dynamic stress can also be ignored in the experiment. The resistance to deformation is mainly related to the ratio of the two dynamic stresses(the historical coefficient of cyclic stress). The reason is that the rockfill particle is relatively sliding, rotating and breaking under the effect of cyclic stress history, which leads to the fact that the contact area increases, the bite ability strengthens, and the particles form the relatively stable skeleton structure. When the cyclic loads are applied again, the stability of the structure has difficulty in adjusting, so that the deformation of rockfill materials is reduced, and the ability to resist the deformation is increased.
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Received: 01 November 2017
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