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Sciences in Cold and Arid Regions ›› 2015, Vol. 7 ›› Issue (4): 335-339.doi: 10.3724/SP.J.1226.2015.00335

• ARTICLES • Previous Articles    

Strength and stiffness variation of frozen soilsaccording to confinement during freezing

SangYeob Kim, JongSub Lee   

  1. School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-701, Republic of Korea
  • Received:2015-02-17 Revised:2015-05-24 Published:2018-11-23
  • Contact: Ph.D., JongSub Lee, Professor of School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-701, Republic of Korea. Tel: +82-2-3290-3325; E-mail: jongsub@korea.ac.kr E-mail:jongsub@korea.ac.kr
  • Supported by:
    This research was supported by a grant(13IFIP-B06700801) from Plant Research Program funded by Korea Agency for Infrastructure Technology Advancement.

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Abstract: When water between soil particles is frozen, the strength and stiffness behavior of soils significantly change. Thus, numerous experimental studies in the laboratory have been carried out to characterize the strength and stiffness of frozen soils. The goals of this study are to evaluate the strength characteristics of frozen soils, which underwent confinement in freezing and shearing stages, and to estimate the stiffness variation by shear wave velocity during shear phase. The specimens are prepared in a brass cell by mixing sand and silt with 10% degree of saturation at a relative density of 60%. The applied normal stresses as confining stresses are 5, 10, 25 and 50 kPa. When the temperature of the specimens is lowered up to -5 ℃, direct shear tests are carried out. Furthermore, shear waves are continuously measured through bender elements during shearing stage for the investigation of stiffness change. Test results show that shear strength and stiffness are significantly affected by the confining stress in freezing and shearing phases. This study suggests that the strength and stiffness of frozen soils may be dependent on the confining stresses applied during freezing and shearing.

Key words: frozen soil, strength, stiffness, shear, confinement

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