科研之友
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摘要
This paper presents a series of triaxial dynamic tests under constant and variable confining pressure to explore the characteristics of cumulative deformation and resillient deformation for frozen coarse-grained fillers. Testing results indicate that axial cumulative plastic strain increases with the increase of freezing negative temperature and with the decrease of the content of coarse particles. The volumetric strain first decreases and then increases with the decrease of temperature at five cyclic stress amplitudes. The three-stage development features of volumetric strain with the increasing of the content of coarse particles were experimentally determinated. The accumulative plastic strains of subgrade fillings were further analyzed and classified based on three existing shakedown criteria. The assessment capabilities of three shakedown criteria were examined by testing results. Based on Werkmeister criterion, the cumulative permanent strain of frozen sample has a tendency of arriving to the plastic creep area under variable confining pressure. According to Ma criterion, similar evaluation results can be found under constant confining pressure. The cumulative permanent strain of all testing samples distribute in the plastic shakedown area that corresponding to the Chen criterion. The defining method for demarcation point between the post-compaction compression stage and secondary cyclic compression stage is non-ignorable factor for reliably evaluating the cumulative plastic deformation of frozen coarse-grained fillers based on three criteria.
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单位冻土工程国家重点实验室; 中国科学院大学
