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A Grain-Scale Model for Soil-Water Retention Hysteresis
Soil water characteristic curves, defining the correlation between water content and suction, are essential for investigating the constitutive behaviour of unsaturated soils. The SWCC during wetting is known to differ from that during drainage, demonstrating a feature of hysteresis. The contact angle effect is one of the main causes for this hysteretic behaviour. By analysing the topological configurations of liquid bridges presented between soil particles, a grain-scale model is presented to quantitatively evaluate the corresponding contributions of the intrinsic liquid pressure and surface tension. Verified with available experimental results, the analytical solution obtained from the model for soils with varied advanced and receding angles shows a good consistency. Furthermore, comparisons are made to analyse matric suction arising from different sized soil particles. The intrinsic liquid pressure is also compared with the matric suction that accounts for the additional interfacial energy determined by the surface tension and interfacial area between water and air phases. This study provides a first attempt to construct a constitutive framework to explicitly connect measurable physical quantities at the grain-scale to the effective hydro-mechanical properties of soils.
A Grain-Scale Model for Soil-Water Retention Hysteresis
Soil water characteristic curves, defining the correlation between water content and suction, are essential for investigating the constitutive behaviour of unsaturated soils. The SWCC during wetting is known to differ from that during drainage, demonstrating a feature of hysteresis. The contact angle effect is one of the main causes for this hysteretic behaviour. By analysing the topological configurations of liquid bridges presented between soil particles, a grain-scale model is presented to quantitatively evaluate the corresponding contributions of the intrinsic liquid pressure and surface tension. Verified with available experimental results, the analytical solution obtained from the model for soils with varied advanced and receding angles shows a good consistency. Furthermore, comparisons are made to analyse matric suction arising from different sized soil particles. The intrinsic liquid pressure is also compared with the matric suction that accounts for the additional interfacial energy determined by the surface tension and interfacial area between water and air phases. This study provides a first attempt to construct a constitutive framework to explicitly connect measurable physical quantities at the grain-scale to the effective hydro-mechanical properties of soils.
A Grain-Scale Model for Soil-Water Retention Hysteresis
Shi, Zhang (author) / Gan, Yixiang (author)
Sixth Biot Conference on Poromechanics ; 2017 ; Paris, France
Poromechanics VI ; 457-464
2017-07-06
Conference paper
Electronic Resource
English
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