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A bounding surface model for unsaturated soils considering the microscopic pore structure and interparticle bonding effect due to water menisci
https://orcid.org/http://orcid.org/0000-0001-8305-2196
https://orcid.org/http://orcid.org/0000-0001-5209-5169
The interparticle bonding effect due to water menisci plays an important role in the hydromechanical coupling properties of unsaturated soils. This paper presents an unsaturated hydromechanical coupling model that considers the influence of matric suction, degree of saturation, and microscopic pore structure on the interparticle bonding effect. The enhanced effective stress and bonding variable are selected as constitutive variables. The bonding variable is correlated with the ratio between unsaturated void ratio and saturated void ratio. The deformation characteristics of unsaturated soils are described based on the bounding surface plasticity theory. A soil–water characteristic model that considers deformation and hydraulic hysteresis is integrated into the constitutive model to achieve hydromechanical coupling. The proposed model can effectively describe the hydromechanical coupling characteristics and the meniscus bonding force of unsaturated bimodal structure soils; the model parameters can be easily obtained through routine experiments. The experimental results of unsaturated isotropic compression, the wetting/drying cycle, and unsaturated triaxial shear tests are used to validate the capability of the proposed model.
A bounding surface model for unsaturated soils considering the microscopic pore structure and interparticle bonding effect due to water menisci
https://orcid.org/http://orcid.org/0000-0001-8305-2196
https://orcid.org/http://orcid.org/0000-0001-5209-5169
The interparticle bonding effect due to water menisci plays an important role in the hydromechanical coupling properties of unsaturated soils. This paper presents an unsaturated hydromechanical coupling model that considers the influence of matric suction, degree of saturation, and microscopic pore structure on the interparticle bonding effect. The enhanced effective stress and bonding variable are selected as constitutive variables. The bonding variable is correlated with the ratio between unsaturated void ratio and saturated void ratio. The deformation characteristics of unsaturated soils are described based on the bounding surface plasticity theory. A soil–water characteristic model that considers deformation and hydraulic hysteresis is integrated into the constitutive model to achieve hydromechanical coupling. The proposed model can effectively describe the hydromechanical coupling characteristics and the meniscus bonding force of unsaturated bimodal structure soils; the model parameters can be easily obtained through routine experiments. The experimental results of unsaturated isotropic compression, the wetting/drying cycle, and unsaturated triaxial shear tests are used to validate the capability of the proposed model.
A bounding surface model for unsaturated soils considering the microscopic pore structure and interparticle bonding effect due to water menisci
https://orcid.org/http://orcid.org/0000-0001-8305-2196
https://orcid.org/http://orcid.org/0000-0001-5209-5169
The interparticle bonding effect due to water menisci plays an important role in the hydromechanical coupling properties of unsaturated soils. This paper presents an unsaturated hydromechanical coupling model that considers the influence of matric suction, degree of saturation, and microscopic pore structure on the interparticle bonding effect. The enhanced effective stress and bonding variable are selected as constitutive variables. The bonding variable is correlated with the ratio between unsaturated void ratio and saturated void ratio. The deformation characteristics of unsaturated soils are described based on the bounding surface plasticity theory. A soil–water characteristic model that considers deformation and hydraulic hysteresis is integrated into the constitutive model to achieve hydromechanical coupling. The proposed model can effectively describe the hydromechanical coupling characteristics and the meniscus bonding force of unsaturated bimodal structure soils; the model parameters can be easily obtained through routine experiments. The experimental results of unsaturated isotropic compression, the wetting/drying cycle, and unsaturated triaxial shear tests are used to validate the capability of the proposed model.
A bounding surface model for unsaturated soils considering the microscopic pore structure and interparticle bonding effect due to water menisci
Acta Geotech.
Han, Bowen (author) / Cai, Guoqing (author) / Zhou, Annan (author) / Li, Jian (author) / Zhao, Chenggang (author)
Acta Geotechnica ; 16 ; 1331-1354
2021-05-01
24 pages
Article (Journal)
Electronic Resource
English
Bounding surface model , Hydromechanical coupling , Interparticle bonding effect , Microscopic pore structure , Unsaturated soils Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics
A unified bounding surface plasticity model for unsaturated soils
| British Library Online Contents | 2006