THM modelling of soils using hypoplasticity - MPGS0136

• Title: THM modelování zemin pomocí hypoplasticity
• Czech title: THM modelování zemin pomocí hypoplasticity
• Guaranteed by: Institute of Hydrogeology, Engineering Geology and Applied Geophysics (31-450)
• Faculty: Faculty of Science
• Actual: from 2022
• Semester: winter
• E-Credits: 3
• Examination process: winter s.:practical
• Hours per week, examination: winter s.:2/0, Ex [HT]
• Capacity: unlimited
• Min. number of students: unlimited
• 4EU+: no
• Virtual mobility / capacity: no
• State of the course: taught
• Language: English
• Note: course is intended for doctoral students only; enabled for web enrollment
• Guarantor: prof. RNDr. David Mašín, Ph.D.

Annotation

In the course, the students learn fundamentals of hypoplasticty and its application to THM problems. Hypoplasticity is an approach to constitutive modelling of geomaterials, which proved to be successful in modelling the non-linear state dependent soil behaviour. These aspects were found to be critical in a wide range of applications, starting with the impact of underground works (tunnels, deep excavations) on existing infrastructure, continuing with design of offshore foundations and ending with predictions of nuclear waste disposal facilities. The aim of the course is to provide a comprehensive review of the practically applicable versions of hypoplastic models. The course starts with an overview of the granular soil and fine-grained soil behaviour. Subsequently, hypoplasticity is set up within the broader constitutive modelling framework. Mathematical formulation of hypoplasticity is later described in detail and two basic models are introduced: model for granular materials and model for clays. Both these models can be enhanced by the so-called intergranular strain concept for small strain stiffness predictions, which is described in subsequent part of the course. Emphasis is put on description of procedures for calibration of the model parameters. Finally, a number of advanced topics on THM behaviour is introduced, which may be important for solving specific case studies.

Last update: Mašín David, prof. RNDr., Ph.D. (11.09.2023)

Literature

Mašín, D. (2019). Modelling of Soil Behaviour with Hypoplasticity - Another Approach to

Soil Constitutive Modelling. Springer International Publishing, 192 p., ISBN: 978-3-030-03975-2.

Last update: Rubešová Jana, RNDr., Ph.D. (21.08.2023)

Syllabus

1
Outline of the course

2
Fundamentals of soil behaviour
Non-linearity of soil behaviour
Asymptotic states

3
Basics of soil constitutive modelling
Basic definitions
Elasto-plasticity
Simple 1D hypoplastic model

4
Classification of constitutive models
Non-linearity and incremental non-linearity
Response envelopes

5
Development of hypoplastic constitutive models
First hypoplastic equations (1985-1992)
Comprehensive model for granular materials (1994-1996)
Further developments of basic hypoplasticity (1997-2005)
Explicit incorporation of asymptotic states

6
Modelling small strain stiffness in hypoplasticity
Introduction
Rachetting in hypoplasticity
Intergranular strain
Hypoplastic equation with intergranular strain in 1D
Hypoplastic equation with intergranular strain in 3D

10
Modelling the effects of structure (fabric, bonding, crushing)
11
Stiffness anisotropy
12
Rate effects
13
Unsaturated soils
14
Expansive soils
15
Thermal effects

Last update: Mašín David, prof. RNDr., Ph.D. (11.09.2023)