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Risorse bibliografiche
Risorsa bibliografica obbligatoria
Risorsa bibliografica facoltativa
Scheda Riassuntiva
Anno Accademico 2020/2021
Scuola Scuola di Ingegneria Civile, Ambientale e Territoriale
Insegnamento 056258 - GEOTECHNICAL MODELLING
  • 056257 - GEOTECHNICAL MODELLING [2ND MOD]
Docente Jommi Cristina
Cfu 5.00 Tipo insegnamento Modulo Di Corso Strutturato

Corso di Studi Codice Piano di Studio preventivamente approvato Da (compreso) A (escluso) Insegnamento
Ing - Civ (Mag.)(ord. 270) - MI (488) INGEGNERIA CIVILE - CIVIL ENGINEERING*AZZZZ055764 - ELEMENTS OF GEOTECHNICAL MODELLING
056203 - GEOTECHNICAL MODELLING 2ND
056258 - GEOTECHNICAL MODELLING
052333 - GEOTECHNICAL MODELLING

Obiettivi dell'insegnamento

The course focuses on the principles and the analytical and numerical tools needed to model the behaviour of soils and the response of geotechnical systems under time dependent loads, for engineering applications. Hydro-mechanical, thermo-mechanical and chemo-mechanical coupling are addressed. The role of non-linearity, initial state, and previous stress history is emphasised. Physical modelling is introduced as a complementary tool for the analysis.


Risultati di apprendimento attesi

The aim of course is to develop understanding on how the physical behaviour of soils can be described in mathematical terms accounting for multiphysics coupling, how simple strain hardening elastic-plastic models for the main categories of soils can be developed and implemented, how an appropriate soil model can be chosen, initialised and calibrated to be used in a numerical analysis,  what is the role of the ratio between the rate of loading and the rate of response of geotechnical systems, and how geotechnical design and assessment can be tackled by a numerical approach in the design and in the assessment.

 

At the end of the second module the students will be able to (vi) evaluate the role of loading rate on the response of a geotechnical system; (vii) choose the appropriate set of field equations necessary to solve practical geotechnical problems with emphasis on civil and environmental engineering applications; (viii) design a finite element model for the non-linear analysis of a typical geotechnical design problem; (ix) properly elaborate the results of a numerical analysis and discuss its limitations; (x) evaluate the potential of a numerical analysis for Serviceability Limit States (SLS) and Ultimate Limit States (ULS) compared to simplified analytical solutions.


Argomenti trattati

The contact hours are organised with a combination of lectures and practical sessions. The lectures will introduce the students the main principles of soil modelling, at both the material and the engineering scale.

 

The topics addressed in the second module include:

  • Hydro-mechanical coupling in the geotechnical analysis: beyond Terzaghi 1D consolidation theory. Rate of loading vs. rate of dissipation. Drained and undrained conditions. Time dependent and cyclic loading.
  • Formulation of the general coupled governing equations, and their finite element discretisation.
  • Drained, undrained and time dependent coupled analysis: choices, advantages and limitations.
  • Basics of Finite Element Method for geotechnical applications: geostatic stress; initialisation of stress state and state variables; boundary conditions; non-linear analysis; drained, undrained and fully coupled analysis.
  • Soil structure interaction: how can we deal with it?
  • Variable geometry in geotechnical engineering: construction and excavation.
  • How does the formulation of the coupled problem change for unsaturated conditions? The fully coupled three-phase formulation and a two-phase simplified solution. Boundary and initial conditions.
  • Applications of unsaturated soils concepts: undisturbed sampling, free surface flow and pumping, rainfall induced landslides.
  • Introduction to physical modelling principles.

 

Practical sessions include exercises and applications aimed at introducing the students to the implementation of the previous concept in the geotechnical engineering analysis and assessing the comprehension of the main theoretical background concepts. A series of practical sessions is dedicated to introduce the students the numerical code they will use for part of their homework.


Prerequisiti

Continuum Mechanics; Soil Mechanics; Basic concepts on the numerical analysis of linear systems.


Modalità di valutazione

Assessment of the learning objectives include formative assessment during the course period and evaluation assessment at the end of the course. During the course the students will get a number of group reports to complete as homework. For those groups who will hand in the reports by the deadlines given in due course, a preliminary assessment and feedback will be given, for them to self-evaluate achievement of the learning objectives and improve any insufficient part. Handing in the assignments in due time during the course is highly recommended, though not compulsory.

 

All the home assignment reports must be handed in one week before the chosen examination date, the latest, for the final evaluation purpose.

 

The final evaluation will include the home assignment reports and an oral examination. The written reports will be evaluated for the student capability to bring theoretical knowledge to the solution of practical engineering problems, including the choice of suitable models for different geotechnical applications, the interpretation of the laboratory tests, the choice and the calibration of adequate models for the different soils, the numerical simulation of selected geotechnical systems. The oral examination will start with a discussion on the content of the reports, and aims at assessing achievement of the learning objectives, including the fundamental theory which modelling is built on.


Bibliografia
Risorsa bibliografica obbligatoriaMuir-Wood D., Geotechnical Modelling, Editore: Taylor & Francis, Anno edizione: 2004
Risorsa bibliografica obbligatoriaJournal / Conference papers on selected topics uploaded on BeeP
Risorsa bibliografica obbligatoriaCourse Notes on selected topics uploaded on BeeP
Risorsa bibliografica facoltativaD.M. Potts & L. Zdravkovic, Finite element analysis in geotechnical engineering: theory, Editore: Thomas Telford, London, Anno edizione: 1999
Risorsa bibliografica facoltativaD.M. Potts, L. Zdravkovic, T.I. Addenbrooke, K.G. Higgins & N. Kovacevic, Finite element analysis in geotechnical engineering: application., Editore: Thomas Telford, London, Anno edizione: 2001
Risorsa bibliografica facoltativaI.M. Smith, D.V. Griffiths & L. Margetts, Programming the finite element method, Editore: John Wiley & Sons, Chichester, Anno edizione: 2013

Software utilizzato
Nessun software richiesto

Forme didattiche
Tipo Forma Didattica Ore di attività svolte in aula
(hh:mm)
Ore di studio autonome
(hh:mm)
Lezione
24:00
36:00
Esercitazione
26:00
39:00
Laboratorio Informatico
0:00
0:00
Laboratorio Sperimentale
0:00
0:00
Laboratorio Di Progetto
0:00
0:00
Totale 50:00 75:00

Informazioni in lingua inglese a supporto dell'internazionalizzazione
Insegnamento erogato in lingua Inglese

Note Docente
schedaincarico v. 1.7.2 / 1.7.2
Area Servizi ICT
01/07/2022