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Volume 42 Issue 11
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ZHANG Kun-yong, XU Na, CHEN Shu, ENAMULLAH Baba Kalan, XIE Yu-fei. Experimental study on fully softened shear strength of expansive soil[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(11): 1988-1995. DOI: 10.11779/CJGE202011003
Citation: ZHANG Kun-yong, XU Na, CHEN Shu, ENAMULLAH Baba Kalan, XIE Yu-fei. Experimental study on fully softened shear strength of expansive soil[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(11): 1988-1995. DOI: 10.11779/CJGE202011003
shu

Experimental study on fully softened shear strength of expansive soil

  • 1.

    Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210024, China

  • 2.

    Geotechnical Engineering Institute, Hohai University, Nanjing 210024, China

  • 3.

    Water Resources Bureau of Shenzhen Municipality, Shenzhen 518000, China

  • 4.

    School of Municipal and Environmental Engineering, Henan University of Urban Construction, Pingdingshan 467036, China

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  • Received Date: September 02, 2019
  • Available Online: December 05, 2022
    Graphical Abstract
    • Abstract
  • The fully softened strength tests are carried out on the expansive soil samples from the Yangtze-Huaihe River Water Transfer Project. The fully softened strength indexes under different moisture contents and shear rates are discussed and analyzed. On this basis, they are compared with the shear strength indexes from the wetting-drying cycle direct shear tests on expansive soil. The results show that in the fully softened state, the cohesive force of expansive soil is close to zero, and the fully softened strength is mainly determined by the inernal friction angle. The inernal friction angle is little affected by the moisture content and shear rate. The strength indexes obtained from wetting-dring cycle tests and fully softened tests are applied to the safety analysis of simple expansive soil slope respectively. Compared with the wetting-drying cycle direct shear tests, the fully softened strenght tests need less lab work and shorter test peroid. The fully softened strength indexes can also reflect the failure mechanism of the shallow failure of expansive soil slopes after wetting-drying cycles in practice. It is recommended to apply the fully softened strength indexes in the analysis of the shallow stability of expansive soil slopes after wetting-drying cycles.
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    • References (23)
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