Characteristics of dynamic strain and strength of frozen
silt under long-term dynamic loading |
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| Authors: | ShuPing Zhao Wei M GuiDe Jiao and XiaoXiao Chang |
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| Institution: | State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute,
Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute,
Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute,
Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
2. Civil and Engineering Department, Lanzhou University, Lanzhou, Gansu 7;State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute,
Chinese Academy of Sciences, Lanzhou, Gansu 730000, China |
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| Abstract: | The dynamic strain and strength of frozen silt under long-term dynamic loading are studied based on creep tests. Three groups of
tests are performed (Groups I, II, and III). The initial deviator stresses of Groups I and II are same and the dynamic stress amplitude
of Group II is twice as that of Group I. The minimum value of dynamic stress in Group III is near zero and its dynamic stress
amplitude is larger than those of Groups I and II. In tests of all three groups there are similar change trends of accumulative strain,
but with different values. The accumulative strain curves consist of three stages, namely, the initial stage, the steady stage, and the
gradual flow stage. In the tests of Groups I and II, during the initial stage with vibration times less than 50 loops the strain amplitude
decreased with the increase of vibration times and then basically remained constant, fluctuating in a very small range. For the
tests of Group III, during the initial and steady stages the strain amplitude decreased with the increase of vibration times, and then
increased rapidly in the gradual flow stage. The dynamic strength of frozen silt decreases and trends to terminal dynamic strength
as the vibration times of loading increase. |
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| Keywords: | frozen silt long-term dynamic loading accumulative strain strain amplitude residual strain dynamic strength |
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