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Finite Deformation Modelling of Cone Penetration Tests in Saturated Structured Clays
In this work, the complex coupled deformation and flow processes occurring in the soil around a CPTu penetrometer during a test in structured natural clays are investigated by means of the Geotechnical Particle Finite Element Method (GPFEM) code. The GPFEM implementation adopted incorporates a fully coupled hydro-mechanical formulation, based on regularized, mixed low-order linear strain triangles. To capture the relevant features of the mechanical response of natural structured clays, the soil behaviour is described using a finite deformation, non-associative elastic-plastic model for this class of geomaterials, referred as FD_Milan model. The model formulation is based on a multiplicative decomposition of the deformation gradient and on the adoption of an elastic response based on the existence of a suitable free energy function. Two bonding-related internal variables, quantifying the effects of structure on the yield locus, are incorporated to provide a macroscopic description of mechanical destructuration effects. To deal with strain localization phenomena, the model is equipped with a non-local version of the hardening laws. The numerical model has demonstrated capable of capturing the destructuration associated with plastic deformations around the cone tip; the space and time evolution of pore water pressure as the cone tip advances; the effect of soil permeability on predicted excess pore water pressures, and the effect of soil bonding on predicted values of cone tip resistance.
Finite Deformation Modelling of Cone Penetration Tests in Saturated Structured Clays
In this work, the complex coupled deformation and flow processes occurring in the soil around a CPTu penetrometer during a test in structured natural clays are investigated by means of the Geotechnical Particle Finite Element Method (GPFEM) code. The GPFEM implementation adopted incorporates a fully coupled hydro-mechanical formulation, based on regularized, mixed low-order linear strain triangles. To capture the relevant features of the mechanical response of natural structured clays, the soil behaviour is described using a finite deformation, non-associative elastic-plastic model for this class of geomaterials, referred as FD_Milan model. The model formulation is based on a multiplicative decomposition of the deformation gradient and on the adoption of an elastic response based on the existence of a suitable free energy function. Two bonding-related internal variables, quantifying the effects of structure on the yield locus, are incorporated to provide a macroscopic description of mechanical destructuration effects. To deal with strain localization phenomena, the model is equipped with a non-local version of the hardening laws. The numerical model has demonstrated capable of capturing the destructuration associated with plastic deformations around the cone tip; the space and time evolution of pore water pressure as the cone tip advances; the effect of soil permeability on predicted excess pore water pressures, and the effect of soil bonding on predicted values of cone tip resistance.
Finite Deformation Modelling of Cone Penetration Tests in Saturated Structured Clays
Lecture Notes in Civil Engineering
Barla, Marco (editor) / Di Donna, Alice (editor) / Sterpi, Donatella (editor) / Insana, Alessandra (editor) / Ciantia, Matteo O. (author) / Oliynyk, Kateryna (author) / Tamagnini, Claudio (author)
International Conference of the International Association for Computer Methods and Advances in Geomechanics ; 2022 ; Turin, Italy
2022-07-31
8 pages
Article/Chapter (Book)
Electronic Resource
English
Miniature Cone Penetration Tests in Soft and Stiff Clays
| British Library Online Contents | 2000
Miniature Cone Penetration Tests in Soft and Stiff Clays
| Online Contents | 2000