Obtaining the Mechanical Parameters for the Hardening Soil Model of Tropical Soils in the City of Brasília

Rebolledo, Juan Félix Rodríguez; León, Raimundo Francisco Pérez; Carvalho, José Camapum de

doi:10.28927/sr.421061

Cited by 10 publications

(11 citation statements)

References 9 publications

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“…The research was conducted by using Plaxis 3D software, which is widely used for geotechnical analysis. As mentioned by Rodríguez-Rebolledo et al (2019), soil constitutive models have advanced significantly from basic models that idealize the soil as a linear elastic medium or a perfectly plastic linear elastic medium. The HSM is an isotropic hardening double surface plasticity model that gives more accurate displacements patterns for conditions at working load (Schanz et al, 1999).…”

Section: Hardening Soil Model (Hsm)mentioning

confidence: 99%

Validation of a 3D numerical model for piled raft systems founded in soft soils undergoing regional subsidence

Posse¹,

Rebolledo²,

Garcia³

et al. 2021

S&R

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In this paper a 3D numerical model using a software based on the Finite Element Method (FEM), was developed and validated using the results obtained in a geotechnical centrifuge model of a piled raft system founded in soft soils undergoing regional subsidence. The piled raft configuration had nine piles distributed in the center of the raft. The kaolin parameters were obtained, calibrated, and validated for the Hardening Soil Model (HSM), based on laboratory triaxial and oedometer test results. Also, a single pile load test was carried out in the centrifuge to get the resistance parameters used in the FEM. The developed numerical model reproduced satisfactorily soil and foundation consolidation displacements due, not only by the structural service load but also by the pore pressure drawdown. For load distribution on piles and raft, the model reproduces with good agreement the foundation behavior only for the structural service load, for pore pressure drawdown some adjustments on the embedded piles elements shaft and base resistance had to be done. The developed model allowed to identify the most sensitive parameters for this type of simulation, to define the types and stages of analysis that had the best fit for the physical model, and to obtain additional results to those measured in the physical model, e.g., the axial load distribution developed along the piles and therefore the magnitude of the negative skin friction, that is an important load that should be considered for the structural safety review of piled foundations subjected to this complex conditions.

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Section: Hardening Soil Model (Hsm)mentioning

confidence: 99%

Validation of a 3D numerical model for piled raft systems founded in soft soils undergoing regional subsidence

Posse¹,

Rebolledo²,

Garcia³

et al. 2021

S&R

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show abstract

“…This program provides valuable geotechnical information obtained from surveys, in situ tests, laboratory tests and loading tests on superficial and deep foundations (Pérez, 2017;Jardim, 1998;Sales, 2000;Guimarães, 2002;Mota, 2003;Coelho, 2013;Sales et al, 2015). According to this information and the tropical soil profiles proposed by Cruz (1987) and Cardoso (2002), Rebolledo et al (2019) defined the typical stratigraphic profile of the CEGUnB, as shown in Fig. 3.…”

Section: Stratigraphy Used In the Modelingmentioning

confidence: 99%

“…The HS model is one of the most complete constitutive models of PLAXIS and is capable of: 1) calculating the total strains using a stress-dependent stiffness that is different for loading and unloading/reloading conditions, and 2) modeling irreversible strains due to primary deviatoric loading (shear hardening) and modeling irreversible plastic strains due to primary compression under oedometric and isotropic loading (compression hardening). (Rebolledo et al, 2019). ogy presented began with the evaluation of the strength and compressibility parameters of triaxial CU tests (with isotropic and anisotropic consolidation) and one-dimensional consolidation tests, respectively (Guimarães, 2002).…”

Section: Stratigraphy Used In the Modelingmentioning

confidence: 99%

“…Table 1 -Geotechnical model proposed by the CEGUnB for the natural moisture state for the HS model (Rebolledo et al, 2019).…”

Section: Definition Of the Problem Geometrymentioning

confidence: 99%

“…In this study, the performance of rigid inclusion foundations in settlement control is evaluated through numerical modeling. Two-and three-dimensional (2D and 3D) PLAXIS software models were used considering the mechanical parameters of the characteristic soils of the city of Brasília, obtained, calibrated and validated (Rebolledo et al, 2019) for the Hardening Soil (HS) model based on laboratory and field test results obtained in previous studies conducted in the Experimental Field of the University of Brasília (CEGUnB).…”

Section: Introductionmentioning

confidence: 99%

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Performance Evaluation of Rigid Inclusion Foundations in the Reduction of Settlements

Rebolledo¹,

León²,

Carvalho³

2019

Self Cite

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In this study, numerical modeling is used to evaluate the performance of rigid inclusion foundations for settlement control considering the characteristic soils of the city of Brasília, Federal District, Brazil. Two-and threedimensional (2D and 3D) PLAXIS software models were used considering the Hardening Soil constitutive model parameters previously obtained, calibrated and validated by the authors. First, the general concepts regarding systems with rigid inclusions are presented. Then, parametric 2D axisymmetric numerical modeling is shown, where the spacing between inclusions, the height of the distribution layer and the soil conditions were varied. The load transfer mechanisms were analyzed, including the performance of rigid inclusions for settlement control. Finally, 3D modeling was performed with the information from a real project located in the Federal District. In the 3D modeling, the performance of the rigid inclusion foundation was compared with that of a slab foundation solution; then, the obtained settlements and angular distortions were compared with the serviceability limit states indicated in the literature. The results show that for the analyzed conditions, rigid inclusion foundations can be considered to be reliable foundation solutions. However, feedback from instrumentation cases in the city of Brasilia is required to further validate the design considerations.

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Exploring Tailings Dam Stability Considering Uncertainties in the Critical State Parameters of the NorSand Model

Silva,

Gomes,

Huertas

et al. 2024

Geotech Geol Eng

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Obtaining the Mechanical Parameters for the Hardening Soil Model of Tropical Soils in the City of Brasília

Cited by 10 publications

References 9 publications

Validation of a 3D numerical model for piled raft systems founded in soft soils undergoing regional subsidence

Validation of a 3D numerical model for piled raft systems founded in soft soils undergoing regional subsidence

Performance Evaluation of Rigid Inclusion Foundations in the Reduction of Settlements

Exploring Tailings Dam Stability Considering Uncertainties in the Critical State Parameters of the NorSand Model

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