Enhanced Fractional Model for Soil–Structure Interface Considering 3D Stress State and Fabric Effect
Publication: Journal of Engineering Mechanics
Volume 148, Issue 9
Abstract
Engineering structures in the field are exposed to three-dimensional (3D) stress-displacement conditions with fabric evolution occurring within the soil–structure interface. Upon 3D shearing, the fabric of the interface would change with shear displacement, which influences the dilatancy or plastic flow response of the interface. To consider the 3D stress state and fabric effect, an enhanced fractional model for the interface under monotonic and cyclic loads is developed by using a multiaxial loading vector, a fabric-dependent plastic flow vector, and a kinematic hardening rule. The developed model has three key features: (1) 3D stress-displacement response with shear coupling in different directions is considered by the 3D elastoplastic relation; (2) fabric-dependent dilatancy state line of the interface is captured via a fabric scalar; and (3) dependence of particle breakage on the critical state line of the interface is also considered by introducing a shift stress. To validate the proposed model, a series of test results obtained from the interface direct shear test and simple shear test are simulated. Discussions on model performances with and without considering the fabric effect are then carried out. It is found that the developed model can capture the key features, e.g., hardening/softening, dilatancy/contraction, and strength degradation, of different soil–structure interfaces. The evolution of the fabric scalar mobilized the dilatancy state of the interface under cyclic loads, through which the remarkable normal contraction response under cyclic loading is successfully captured when compared to those without considering fabric effect.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The first author is grateful to Prof. Wen Chen for his invaluable inspiration. The financial supports provided by the National Natural Science Foundation of China (Grant Nos. 51890912 and 51878247), the National Science Centre, Poland (Grant No. 2017/27/B/ST8/00351), and the Ulam Program (Grant No. PPN/ULM/2020/1/00026) are appreciated.
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Information
Published In
Journal of Engineering Mechanics
Volume 148 • Issue 9 • September 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Jan 13, 2022
Accepted: Apr 18, 2022
Published online: Jul 12, 2022
Published in print: Sep 1, 2022
Discussion open until: Dec 12, 2022
ASCE Technical Topics:
- Building materials
- Continuum mechanics
- Cyclic loads
- Dilatancy
- Dynamic loads
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Fabric structures
- Fabrics
- Fluid mechanics
- Geomechanics
- Geotechnical engineering
- Hydrologic engineering
- Laboratory tests
- Materials engineering
- Models (by type)
- Shear tests
- Soil mechanics
- Soil properties
- Soil stress
- Solid mechanics
- Structural dynamics
- Structural engineering
- Structures (by type)
- Tests (by type)
- Three-dimensional models
- Water and water resources
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