A Modified Model for Soil-Structure Interface Considering Random Damage of Mesoscopic Contact Elements

The interaction between soil and marine structures like submarine pipeline/pipe pile/suction caisson is a complicated geotechnical mechanism process. In this study, the interface is discretized into multiple mesoscopic contact elements that are damaged randomly throughout the shearing process due to...

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Bibliographic Details
Published in:China ocean engineering 2023-10, Vol.37 (5), p.807-818
Main Authors: Ke, Li-jun, Gao, Yu-feng, Zhao, Zi-hao, Li, Da-yong, Ji, Jian
Format: Article
Language:English
Subjects:
Coastal Sciences
Damage assessment
Engineering
Evolution
Fluid- and Aerodynamics
Heterogeneity
Interfaces
Marine & Freshwater Sciences
Modelling
Mohr-Coulomb theory
Numerical and Computational Physics
Oceanography
Offshore Engineering
Offshore structures
Pipe piles
Plastic deformation
Residual strength
Ring shear tests
Shear stress
Shear tests
Shearing
Simulation
Soil
Soil types
Soil-structure interaction
Statistical models
Underwater pipelines
Underwater structures
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Summary:The interaction between soil and marine structures like submarine pipeline/pipe pile/suction caisson is a complicated geotechnical mechanism process. In this study, the interface is discretized into multiple mesoscopic contact elements that are damaged randomly throughout the shearing process due to the natural heterogeneity. The evolution equation of damage variable is developed based on the Weibull function, which is able to cover a rather wide range of distribution shapes by only two parameters, making it applicable for varying scenarios. Accordingly, a statistical damage model is established by incorporating Mohr–Coulomb strength criterion, in which the interfacial residual strength is considered whereby the strain softening behavior can be described. A concept of “semi-softening” characteristic point on shear stress–displacement curve is proposed for effectively modeling the evolution of strain softening. Finally, a series of ring shear tests of the interfaces between fine sea sand and smooth/rough steel surfaces are conducted. The predicted results using the proposed model are compared with experimental data of this study as well as some results from existing literature, indicating that the model has a good performance in modeling the progressive failure and strain softening behavior for various types of soil–structure interfaces.
ISSN:0890-5487
2191-8945
DOI:10.1007/s13344-023-0067-6