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Volume 56 Issue 5
Oct.  2021
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Journal of Southwest Jiaotong University  > 2021  >  56(5): 1125-1134.
NIE Rusong, DONG Junli, MEI Huihao, LENG Wuming, LI Yafeng, CHENG Longhu. Dynamic Characteristics of Silt Considering Time Intermittent Effect[J]. Journal of Southwest Jiaotong University, 2021, 56(5): 1125-1134. doi: 10.3969/j.issn.0258-2724.20190642
Citation: NIE Rusong, DONG Junli, MEI Huihao, LENG Wuming, LI Yafeng, CHENG Longhu. Dynamic Characteristics of Silt Considering Time Intermittent Effect[J]. Journal of Southwest Jiaotong University, 2021, 56(5): 1125-1134. doi: 10.3969/j.issn.0258-2724.20190642
shu

Dynamic Characteristics of Silt Considering Time Intermittent Effect

doi: 10.3969/j.issn.0258-2724.20190642
  • Received Date: 06 Aug 2019
  • Rev Recd Date: 06 May 2020
    • Available Online: 03 Jun 2020
  • Publish Date: 15 Oct 2021
    Abstract
  • Train dynamic load is the premise to reveal the real dynamic response characteristics of subgrade. The train load is regarded as a continuous dynamic load in previous cyclic triaxial tests without considering the time intermittent effect. Dynamic triaxial tests of silt under continuous loading and intermittent loading (continuous loading and intermittent alternating circulation) were carried out by using indoor dynamic triaxial apparatus, and the development laws of excess pore water pressure, modulus of resilience and accumulated plastic strain of silt under two loading modes were analyzed. The accumulated excess pore water pressure under continuous dynamic load will dissipate in the intermittent stage, and the axial strain will be restored to a certain extent in the intermittent stage, thus improving the ability of the sample to resist deformation. Ignoring intermittent effect in indoor dynamic triaxial tests will overestimate the cumulative amount of excess pore pressure and plastic strain and the possibility of failure. The permanent deformation behavior of specimens under intermittent loading can be divided into plastic stability, plastic creep, and incremental failure according to stability theory.

     

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