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.
张凌凯,唐新军*,王建祥. 循环应力历史对堆石料变形特性影响规律试验研究[J]. 排灌机械工程学报, 2019, 37(12): 1088-1092.
ZHANG Lingkai,TANG Xinjun*,WANG Jianxiang. Experimental study on effect of cyclic stress history on dynamic deformation of rockfill materials. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(12): 1088-1092.