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Effect mechanism of unfrozen water on the frozen soil-structure interface during the freezing-thawing process

  • Tang, Liyun (Architecture and Civil Engineering School, Xi'an University of Science and Technology) ;
  • Du, Yang (Architecture and Civil Engineering School, Xi'an University of Science and Technology) ;
  • Liu, Lang (Energy School, Xi'an University of Science and Technology) ;
  • Jin, Long (CCCC First Highway Consultants Co. Ltd.) ;
  • Yang, Liujun (Architecture and Civil Engineering School, Xi'an University of Science and Technology) ;
  • Li, Guoyu (State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences)
  • Received : 2020.01.23
  • Accepted : 2020.07.06
  • Published : 2020.08.10

Abstract

The interaction between the frozen soil and building structures deteriorates with the increasing temperature. A nuclear magnetic resonance (NMR) stratification test was conducted with respect to the unfrozen water content on the interface and a shear test was conducted on the frozen soil-structure interface to explore the shear characteristics of the frozen soil-structure interface and its failure mechanism during the thawing process. The test results showed that the unfrozen water at the interface during the thawing process can be clearly distributed in three stages, i.e., freezing, phase transition, and thawing, and that the shear strength of the interface decreases as the unfrozen water content increases. The internal friction angle and cohesive force display a change law of "as one falls, the other rises," and the minimum internal friction angle and maximum cohesive force can be observed at -1℃. In addition, the change characteristics of the interface strength parameters during the freezing process were compared, and the differences between the interface shear characteristics and failure mechanisms during the frozen soil-structure interface freezing-thawing process were discussed. The shear strength parameters of the interface was subjected to different changes during the freezing-thawing process because of the different interaction mechanisms of the molecular structures of ice and water in case of the ice-water phase transition of the test sample during the freezing-thawing process.

Keywords

Acknowledgement

This research was supported by the National Natural Science Foundation of China (No. 41502298).

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