Geomechanics and Engineering

  • 제30권4호
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  • Pages.373-382
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  • 2022
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Soil water retention and hysteresis behaviors of different clayey soils at high suctions

  • Li, Ze (School of Civil and Environmental Engineering, Ningbo University) ;
  • Gao, You (School of Civil and Environmental Engineering, Ningbo University) ;
  • Yu, Haihao (Laboratory of Geomechnics and Geotechnical Engineering, Guilin University of Technology) ;
  • Chen, Bo (College of Civil Engineering and Architecture, Quzhou University) ;
  • Wang, Long (School of Environment and Civil Engineering, Jiangnan University)
  • 투고 : 2021.11.29
  • 심사 : 2022.07.24
  • 발행 : 2022.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

Unsaturated soil at high suctions is widespread. Many civil engineering projects are related to the hydro-mechanical behavior of unsaturated soils at high suctions, particularly in arid and semiarid areas. To investigate water retention behaviors of nine clayey soils (one is classified as fat clay and the others are classified as lean clay according to the unified soil classification system), the high suction (3.29-286.7 MPa) was imposed on the specimens at zero net stress by the vapor equilibrium technique. In this paper, the effect of void ratio on the water retention behavior at high suction was discussed in detail. Validation data showed that soil types, i.e., different mineralogical compositions, are critical in the soil water retention behavior at a high suction range. Second, the hysteresis behavior at a high suction range is mainly related to the clay content and the specific surface area. And the mechanism of water retention and hysteresis behavior at high suctions was discussed. Moreover, the maximum suction is not a unique value, and it is crucial to determine the maximum suction value accurately, especially for the shear strength prediction at high suctions. If the soil consists of hydrophilic minerals such as montmorillonite and illite, the maximum suction will be lower than 106 kPa. Finally, using the area of hysteresis to quantify the degree of hysteresis at a high suction range is proposed. There was a good correlation between the area of hydraulic hysteresis and the specific surface area.

키워드

과제정보

The authors express their gratitude for the grants provided by the National Natural Science Foundation of China (No. 41902279), Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering (No. 20YKF06), the Fundamental Research Funds for the Provincial Universities of Zhejiang (No. SJLY2022007), and the Natural Science Foundation of Jiangsu Province (No. BK20210479).

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