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A platform for research: civil engineering, architecture and urbanism
Modelling of Deep Excavation Collapse Using Hypoplastic Model for Soft Clays
Abstract The extended abstract presents an application of the newly developed hypoplastic model for soft clays. The model is applied to simulation of the well-documented geotechnical failure of a deep excavation occurring at the Nicoll Highway in Singapore. The marine clays occurring at the site are typical example of natural normally consolidated soft soils, which are difficult to characterize and model as they typically suffer from large deformations under loading and their stress-strain behavior is complex. In the new hypoplastic model, anisotropic asymptotic state boundary surface (ASBS) has been implemented to account for soil strength anisotropy. The apparent rotation of the ASBS is implemented by skewing the stress space. Additionally, the tensor L was made bilinear in D to more realistically predict the stress path of natural K0 consolidated soils. The model has been implemented in the form of a user-defined subroutine for Abaqus and Plaxis finite element software. Firstly, it is demonstrated that the model predictions compare well with experimental data on element tests, demonstrating the effect of various features of the model on predictions. Secondly, numerical simulations of Nicoll highway excavation focusing on specific cross-section within the collapse area are presented, demanding good fit between measurement and simulations up to the final stages immediately preceding the excavation collapse.
Modelling of Deep Excavation Collapse Using Hypoplastic Model for Soft Clays
Abstract The extended abstract presents an application of the newly developed hypoplastic model for soft clays. The model is applied to simulation of the well-documented geotechnical failure of a deep excavation occurring at the Nicoll Highway in Singapore. The marine clays occurring at the site are typical example of natural normally consolidated soft soils, which are difficult to characterize and model as they typically suffer from large deformations under loading and their stress-strain behavior is complex. In the new hypoplastic model, anisotropic asymptotic state boundary surface (ASBS) has been implemented to account for soil strength anisotropy. The apparent rotation of the ASBS is implemented by skewing the stress space. Additionally, the tensor L was made bilinear in D to more realistically predict the stress path of natural K0 consolidated soils. The model has been implemented in the form of a user-defined subroutine for Abaqus and Plaxis finite element software. Firstly, it is demonstrated that the model predictions compare well with experimental data on element tests, demonstrating the effect of various features of the model on predictions. Secondly, numerical simulations of Nicoll highway excavation focusing on specific cross-section within the collapse area are presented, demanding good fit between measurement and simulations up to the final stages immediately preceding the excavation collapse.
Modelling of Deep Excavation Collapse Using Hypoplastic Model for Soft Clays
Jerman, Jan (author) / Mašín, David (author)
2018-01-01
6 pages
Article/Chapter (Book)
Electronic Resource
English
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