Soil-water characteristic curve considering temperature and void ratio under capillarity and adsorption

LIU Shuang; LIU Hanlong; XIAO Yang

doi:10.11779/CJGE20231253

Volume 47 Issue 4

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Chinese Journal of Geotechnical Engineering > 2025 > 47(4): 877-886. > DOI: 10.11779/CJGE20231253

LIU Shuang, LIU Hanlong, XIAO Yang. Soil-water characteristic curve considering temperature and void ratio under capillarity and adsorption[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(4): 877-886. DOI: 10.11779/CJGE20231253

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Soil-water characteristic curve considering temperature and void ratio under capillarity and adsorption

LIU Shuang^1,,
LIU Hanlong^{1, 2, 3},
XIAO Yang^{1, 2, 3}

1.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China
3.
National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas, Chongqing 400045, China

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Received Date: December 21, 2023
Available Online: September 26, 2024

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Abstract

Abstract

The soil-water characteristic curve (SWCC) is an important constitutive relationship of unsaturated soils. The temperature and void ratio obviously affect the SWCC of soils. By combining the adsorption and capillary water models for soils with the introduction of a capillary condensation factor, a SWCC model is proposed. Moreover, an analytical solution for wetting coefficient considering temperature is obtained by considering the non-isothermal water-air interfacial tension and enthalpy of immersion per unit area. Then, a temperature-dependent matric suction and SWCC model is established. Additionally, the distribution curves of pores at different void ratios can be obtained by shifting and scaling the curve at the reference state. Then, a void ratio-dependent capillary model is proposed. On this basis, a capillary-adsorption decoupling SWCC model considering temperature, void ratio and capillary condensation is established. The parameters can be determined from two series of test data with different void ratios at the same temperature and one data of different temperatures. The comparison between the predictions and measurements indicates that the proposed model is precise in predicting the SWCCs under different conditions.
- unsaturated soil,
- temperature,
- void ratio,
- capillarity,
- adsorption,
- capillary condensation

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References

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