A bounding surface model for saturated and unsaturated soil‐structure interfaces

Summary In many geotechnical systems, such as reinforced slopes and embankments, soil‐structure interfaces are often unsaturated. Shear behaviour of unsaturated interfaces is strongly dependent on their matric suctions, as revealed by the results of extensive laboratory tests. So far, constitutive m...

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Bibliographic Details
Published in:International journal for numerical and analytical methods in geomechanics 2020-12, Vol.44 (18), p.2412-2429
Main Authors: Zhou, Chao, Tai, Pei, Yin, Jian‐Hua
Format: Article
Language:English
Subjects:
Bounding surface
Constitutive models
critical state
Dilatancy
Embankments
Geotechnical fabrics
Interfaces
Laboratory tests
Mathematical models
Shear
Shear tests
Soil
Soil structure
Soil suction
Soil testing
Soils
soil‐structure interface
suction
unsaturated
Unsaturated soils
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Summary:Summary In many geotechnical systems, such as reinforced slopes and embankments, soil‐structure interfaces are often unsaturated. Shear behaviour of unsaturated interfaces is strongly dependent on their matric suctions, as revealed by the results of extensive laboratory tests. So far, constitutive models for unsaturated interfaces are very limited in the literature. This paper reports a new bounding surface model for saturated and unsaturated interfaces. New formulations were developed to incorporate suction effects on the flow rule and plastic modulus. To examine the capability of the proposed model, it was applied to simulate suction‐ and stress‐controlled direct shear tests on unsaturated soil–cement, soil–steel and soil–geotextile interfaces. Measured and computed results are well matched, demonstrating that the proposed model can well capture key features of the shear behaviour of unsaturated interfaces, including suction‐dependent dilatancy, stress–strain relation and peak and critical state shear strengths.
ISSN:0363-9061
1096-9853
DOI:10.1002/nag.3123