(1. College of Civil Engineering and Architecture，Zhejiang University，Hangzhou，Zhejiang 310058，China；
2. Department of Civil Engineering，Zhejiang University City College，Hangzhou，Zhejiang 310015，China)
Abstract：Artificial freezing method is widely used in the construction of subway，and freezing-thawing action will results in changes of hysteretic curves and damping ratio of soil. Dynamic triaxial test was operated on frozen-thawed soil samples to obtain the developing patterns of hysteretic curves and damping ratio of soil samples under cyclic subway loading. The test results show that, under cyclic loading，hysteretic loops change from wide to thin and long，that the area and opening of hysteretic loops increase with decreasing the freezing temperature or the consolidation degree，and that the effect of the cyclic load cannot offset the effect of the freezing temperature and the consolidation degree. With increasing the number of loading cycle，the damping ratio in turn declines rapidly，keeps constant，increases slightly，decreases slowly and tends to be stable. Both the initial and final stable damping ratios increase markedly with decreasing the freezing temperature. Decreasing the consolidation degree makes the initial damping ratio decrease conspicuously while has no obvious influence on the final stable damping ratio. The relationship between the damping ratio and cyclic loading times boils down to the relationship between the damping ratio and the accumulated strain. Based on the experimental data, a function describing the relationship of the damping ratio and the accumulated axial strain was derived. The study can give a beneficial guidance on controlling the post-construction settlement of the area where artificial frozen method is applied.
魏新江1，2，庄家煌1，丁 智2，蔡知进1. 地铁循环荷载作用下冻融土滞回曲线及阻尼比特性研究[J]. 岩石力学与工程学报, 2019, 38(10): 2092-2102.
WEI Xinjiang1，2，ZHUANG Jiahuang1，DING Zhi2，CAI Zhijin1. Research on the characteristics of hysteretic curves and damping ratio of frozen-thawed soils under cyclic subway loading. , 2019, 38(10): 2092-2102.
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2019, Vol. 38 
