Výsledky vyhledávání - "Rafał F. Obrzud"

Selected aspects of designing deep excavations

Autor: Sébastien Hartmann, Rafał F. Obrzud, Krzysztof Podleś

Publikováno v: Studia Geotechnica et Mechanica, Vol 38, Iss 3, Pp 49-66 (2016)

This paper analyzes two approaches to serviceability limit state (SLS) verification for the deep excavation boundary value problem. The verification is carried out by means of the finite element (FE) method with the aid of the commercial program ZSoi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a01389369aa676848553c7554daf8ac0
https://doaj.org/article/2ca9a43d926f480fb089ba8388bb9c64

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Improved Formulation of the Hardening Soil Model in the Context of Modeling the Undrained Behavior of Cohesive Soils

Autor: Andrzej Truty, Rafał F. Obrzud

Publikováno v: Studia Geotechnica et Mechanica, Vol 37, Iss 2, Pp 61-68 (2015)

The analysis of an important drawback of the well known Hardening Soil model (HSM) is the main purpose of this paper. A special emphasis is put on modifying the HSM to enable an appropriate prediction of the undrained shear strength using a nonzero d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::67fabb8dbf89705cb0b8b9a34be7973a
https://doaj.org/article/6e94a0a60f3e4b20b8a5eaa2d83d1217

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Numerical modeling and neural networks to identify model parameters from piezocone tests: I. FEM analysis of penetration in two-phase continuum

Autor: Rafał F. Obrzud, Laurent Vulliet, Andrzej Truty

Publikováno v: International Journal for Numerical and Analytical Methods in Geomechanics. 35:1703-1730

This study presents a numerical approach designed for material parameter identification for the coupled hydro-mechanical boundary value problem (BVP) of the piezocone test (CPTU) in normally and lightly overconsolidated clayey soils. The study is pre

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a3f8be123ddcff3cf13d19463f423b0f
https://doi.org/10.1002/nag.972

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A combined neural network/gradient-based approach for the identification of constitutive model parameters using self-boring pressuremeter tests

Autor: Andrzej Truty, Rafał F. Obrzud, Laurent Vulliet

Publikováno v: International Journal for Numerical and Analytical Methods in Geomechanics. 33:817-849

This paper presents a numerical procedure of material parameter identification for the coupled hydromechanical boundary value problem (BVP) of the self-boring pressuremeter test (SBPT) in clay. First, the neural network (NN) technique is applied to o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::22dd0db797eb0db927f4e84fac0780ad
https://doi.org/10.1002/nag.750

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Optimization framework for calibration of constitutive models enhanced by neural networks

Autor: Rafał F. Obrzud, Laurent Vulliet, Andrzej Truty

Publikováno v: International Journal for Numerical and Analytical Methods in Geomechanics. 33:71-94

A two-level procedure designed for the estimation of constitutive model parameters is presented in this paper. The neural network (NN) approach at the first level is applied to achieve the first approximation of parameters. This technique is used to

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae9a34702c2b2635a7c2891be6b5d18f
https://doi.org/10.1002/nag.707

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Numerical modeling and neural networks to identify model parameters from piezocone tests: II. Multi-parameter identification from piezocone data

Autor: Andrzej Truty, Laurent Vulliet, Rafał F. Obrzud

This paper completes the study presented in the accompanying paper, and demonstrates a numerical algorithm for parameter prediction from the piezocone test (CPTU) data. This part deals with a development of neural network (NN) models which are able t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20bdf4c1448b60d878e24dd626879166
https://infoscience.epfl.ch/record/164560

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