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Volume 41 Issue 11
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CAI Zheng-yin, CHEN Hao, HUANG Ying-hao, ZHANG Chen. Failure mechanism of canal slopes of expansive soils considering action of wetting-drying cycles[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(11): 1977-1982. DOI: 10.11779/CJGE201911001
Citation: CAI Zheng-yin, CHEN Hao, HUANG Ying-hao, ZHANG Chen. Failure mechanism of canal slopes of expansive soils considering action of wetting-drying cycles[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(11): 1977-1982. DOI: 10.11779/CJGE201911001
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Failure mechanism of canal slopes of expansive soils considering action of wetting-drying cycles

  • 1. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China;
    2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210024, China

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  • Received Date: December 24, 2018
  • Published Date: November 24, 2019
    Graphical Abstract
    • Abstract
  • The canal of expansive soils is in the state of wetting-drying cycle because of seasonal water level fluctuations, and its slope instability is easily induced. The centrifugal model tests are carried out to study the stability of a canal slope of expansive soils under wetting-drying cycles, and its failure mechanism is investigated. It is found that the soil of the canal slope undergoes various wetting-drying cycles due to the repeating water level fluctuations in the canal. After each cycle, the cracks in the soil gradually expand, the water in the canal infiltrates continuously, and the saturated area gradually increases. The stronger the expansive capability of foundation soils, the more severe the crack extension after each wetting-drying cycle, the stronger the infiltration of canal water, and the more easily the canal is destroyed. The main failure mode of the canal caused by wetting-drying cycles of water level fluctuations is shallow instability, which is quite different from the retrogressive landslide discovered by other researchers.
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    • References (10)
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