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  • 1
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    Series available for loan
    Karlsruhe : Institut für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT)
    Associated volumes
    Call number: S 24.89834(187)
    In: Veröffentlichungen des Institutes für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT), Heft 187
    Type of Medium: Series available for loan
    Pages: iv, 257 Seiten , Illustrationen, Diagramme , 21 cm
    ISSN: 04533267
    Series Statement: Veröffentlichungen des Institutes für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT) Heft 187
    Language: English
    Note: Dissertation, Karlsruher Institut für Technologie (KIT), 2019 , 1 Introduction 1.1 Outline of this thesis 1.2 Notation 2 Governing equations 2.1 General concept 2.1.1 Concept of volume fractions and kinematic relations 2.1.2 Effective stress principle 2.2 Conventional model with residual water phase 2.2.1 Conservation of mass 2.2.2 Conservation of linear momentum 2.3 Extended model for quasi-saturated materials 2.3.1 Variables describing the mixture 2.3.2 Conservation of mass 2.3.3 Conservation of linear momentum 2.3.4 Conservation of energy 2.3.5 Air entrapment model 2.3.6 Bulk modulus of occluded air 2.3.7 Simulation examples of element tests 2.4 Final remarks 3 Finite element implementation 3.1 Strongform of governing equations 3.2 Constitutive relations 3.2.1 Mechanical models 3.2.2 Hydraulic models 3.2.3 Pore fluid flow model 3.2.4 Pore fluid compressibility 3.3 Variational and weak form of governing equations 3.4 Spacial discretization 3.5 Solution procedure and time integration algorithm 3.5.1 Scaling of the element contribution 3.5.2 Element contributions to the system of equations 3.6 Numerical integration 3.7 UEL library: Incorporation within Abaqus/Standard 3.7.1 External loads 4 numgeo a new finite element framework 4.1 Pre- and Postprocessing 4.2 Program structure and design 4.2.1 Example of the OOP approach 4.3 Interface to user defined subroutines 4.4 Parallelisation 4.4.1 Parallel element assembling 4.4.2 Parallel performance 4.5 General remarks 4.5.1 Multi Point Constraints 4.5.2 Solution control Contents 4.5.3 Extrapolation of state variables to nodes 5 Verification and performance of the implementation 5.1 One-dimensional consolidation 5.1.1 Saturated sand column 5.1.2 Partially saturated sand column 5.2 Desaturation of a sand column 5.3 ID wave propagation 5.4 Back calculation of a laminar box system 5.5 Back calculation of a centrifuge test 5.5.1 Simulations using the four-phase model 5.5.2 Simulations using the five-phase model 5.6 Final remarks 6 Seismic hazard assessment oflarge opencast slopes 6.1 Site characterisation 6.2 FE model 6.2.1 Material 6.2.2 Initial state 6.2.3 Loading history 6.3 Analysis of the results 6.3.1 Influence of inhomogeneous material distribution 6.3.2 Influence of additional compaction 6.3.3 Influence of saturation 6.3.4 Influence of the boundary condition 6.4 Concluding remarks 7 Summary - Zusammenfassung 7.1 Summary 7.2 Zusammenfassung References A Governing equations A.1 Five-phase TPM - Conservation of energy A.2 u-U-U Formulation A.3 Karlsruhe hydraulic model B numgeo Manual B.1 Starting numgeo B.2 Input file B.3 Commands B.4 User defined subroutines B.4.1 User defined boundary conditions B.4.2 User defined state variables B.4.3 User defined initial stress field B.4.4 Implementation
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  • 2
    Series available for loan
    Series available for loan
    Karlsruhe : Institut für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT)
    Associated volumes
    Call number: S 24.89834(186)
    In: Veröffentlichungen des Institutes für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT), Heft 186
    Type of Medium: Series available for loan
    Pages: viii, 270 Seiten , Illustrationen, Diagramme , 21 cm
    ISSN: 04533267
    Series Statement: Veröffentlichungen des Institutes für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT) Heft 186
    Language: English
    Note: Dissertation, Karlsruher Institut für Technologie (KIT), 2019 , 1 Introduction 1.1 Practical relevance of the subject 1.2 Motivation and aims of research presented in this thesis 1.3 Outline 1.4 Notation 2 Constitutive description 2.1 Elasticity 2.2 Hypoelasticity 2.3 Transverse isotropic (hypo)elasticity 2.4 Dilatancy 2.4.1 From direct shear to general conditions 2.4.2 Overview of expressions describing the state dependent Dilatancy of cohesionless soils 2.4.3 State-dependent Dilatancy for monotonic loading described by Li & Dafalias [1] 2.4.4 State-dependent Dilatancy described by Grandas & Triantafyllidis [2] 2.4.5 Basic postulates for cohesive soils 24 2.4.6 How to evaluate the Dilatancy from undrained triaxial tests on cohesive soils 2.4.7 Revision and reformulation of Taylors' rule [3] to account for the behaviour of cohesive soils 3 Experimental observations on cohesive soils 3.1 Parametric study on Kaolin 3.1.1 Inherent anisotropy 3.1.2 Dilatancy 3.2 Parametric study on Lower Rhine Clay (LRC) 3.2.1 Stress amplitude 3.2.2 Loading frequency 3.2.3 Overconsolidation ratio 3.2.4 Issues 3.2.5 Dilatancy 4 Comparison between different viscous model families 4.1 Charateristic isotachs and overconsolidation ratio 4.2 Creep rate 4.3 Development of constitutive equations 4.3.1 Nonstationary Flow Surface model (NSFS) 4.3.2 Overstress Viscoplastic model (OVP) 4.3.3 Visco-plastic model with Norton's power law (NVP) 4.3.4 Visco-hypoplastic model (VHP) 4.4 Adjustment to a unique reference isotach 4.5 Material parameters 4.6 Numerical implementation 4.7 Element Test Simulations 4.7.1 Isotropic compression with constant strain rate 4.7.2 Creep test 4.7.3 Stress relaxation test 4.7.4 Response envelopes 4.7.5 Undrained creep rupture 4.7.6 Simulation of experiments under oedometric loading 4.8 Final remarks 5 Anisotropic Visco ISA - (AVISA) model 5.1 ISA plasticity 5.1.1 Mechanical model 5.2 Mechanical model formulation under fully mobilized states 5.2.1 Elastic stiffness tensor E 5.2.2 Incorporation of inherent anisotropy and fabric effects 5.2.3 Characteristic surfaces and void ratios 5.2.4 Flow rule m 5.2.5 Overconsolidation ratio OCR 5.2.6 Degree of nonlinearity Y 5.3 Numerical implementation 5.4 Calibration of material parameters 5.4.1 Parameters for the small strain stiffness (IS) 5.4.2 Parameters for the transversal hypoelasticity 5.4.3 Parameters for the critical state and the loading surface 5.4.4 The parameter used to -quantify the creep rate of the material viz. the time-dependent effects 5.5 Simulations of tests under monotonic loading 5.5.1 Soft and/or normally consolidated clays 5.5.2 Stiff and/or ovcrconsolidated clays 5.5.3 Time-dependent behaviour of clays 5.5.4 Directional response 5.5.5 Limitations of the model 5.6 Simulations of tests under cyclic loading 5.6.1 Low plasticity clay - Kaolin 5.6.2 High plasticity clay - Lower Rhine Clay 6 Constitutive anamnesis model for clays 6.1 Historiotropic flow surface 6.1.1 Evolution of back stress tensor σB 6.2 Mechanical model formulation 6.2.1 Elastic stiffness tensor E 6.2.2 Incorporation of inherent anisotropy and fabric effects 6.2.3 Characteristic surfaces and void ratios 6.2.4 Incorporation of Dilatancy in a general hypoplastic model 6.2.5 Overconsolidation ratio OCR 6.2.6 Degree of nonlinearity Y 6.2.7 Flow rule m 6.2.8 Time dependency and critical void ratio 6.2.9 Uniqueness and Attainability of the critical state 6.2.10 Earth pressure coefficient K0 6.3 Inspection: Does the one dimensional version of the model satisfy the special cases? 6.3.1 Using isotropic elasticity (α = 1) 6.3.2 Using transversal isotropic elasticity 6.4 Numerical implementation 6.5 Calibration of material parameters 6.5.1 Parameters for the transversal hypoelasticity 6.5.2 Parameters for the historiotropic surface 6.5.3 Parameters for the critical, loading and dilatancy surface 6.5.4 The parameter used to quantify the creep rate of the material viz. the time-dependent effects 6.6 Simulations of tests under monotonia and cyclic loading 6.6.1 Kaolin 6.6.2 Lower Rhine Clay 6.7 Modified shape of the historiotropic surface 6.8 Final remarks 7 Application to BVP 7.1 Soil improvement by prior loading 7.2 Simulation of the bearing capacity of a shallow foundation 7.2.1 Monotonic loading 7.2.2 Cyclic loading 7.3 Consolidation of Kaolin under alternating cyclic loading 7.3.1 Filter disks in end plates (triaxial test) 7.3.2 Central porous stone in end plates (triaxial test) 7.4 Tunnel settlement of Metro Line No. 4 in Shanghai 7.5 Final remarks 8 Summary and Outlook - Zusammenfassung und Ausblick 8.1 Summary 8.2 Outlook 8.3 Zusammenfassung 8.4 Ausblick Appendix A Required derivatives Appendix B Programming the creep rupture condition for the VHP model Appendix C Mathematica script for the calibration of ei0 Appendix D Summary of constitutive relations of the reference and of AVISA model Appendix E Approximation of the mean pressure p with time t Bibliography
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  • 3
    Series available for loan
    Series available for loan
    Karlsruhe : Institut für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT)
    Associated volumes
    Call number: S 24.89834(189)
    In: Veröffentlichungen des Institutes für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT), Heft 189
    Type of Medium: Series available for loan
    Pages: iv, 200 Seiten , Illustrationen, Diagramme , 21 cm
    ISSN: 04533267
    Series Statement: Veröffentlichungen des Institutes für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT) Heft 189
    Language: English
    Note: Dissertation, Karlsruher Institut für Technologie (KIT), 2020 , 1 Introduction 1.1 Motivation 1.2 Outline of the present work 2 Mechanical response of soft rock laboratory testing 2.1 Presentation of Maastricht Calcarenite 2.2 Experimental set-ups and methods 2.2.1 Set-up for triaxial testing 2.2.2 Specimen preparation and installation 2.2.3 Set-up for oedometer testing 2.2.4 Specimen preparation and installation 2.3 Experimental results and discussion 2.3.1 Uniaxial tests 2.3.2 Isotropic compression tests 2.3.3 Triaxial compression tests 2.3.4 Triaxial extension tests 2.3.5 Elastic parameters 2.3.6 Oedometric test 2.4 Conclusion 3 Simulation of the mechanical response of soft rock 3.0.1 Fundamentals of plasticity theory 3.0.2 Fundamentals of strain localization 3.1 Notation 3.2 Yield surface 3.2.1 Shape parameters 3.2.2 Internal variables 3.3 Non-local model 3.4 Numerical calculation with ABAQUS 3.4.1 Fundamentals 3.4.2 Outline of the Algorithm 3.4.3 Calibration of the model 3.4.4 Simulations of plane stress tests 3.4.5 Simulation of a plane strain test 3.4.6 Simulations of triaxial tests 3.5 Discussion 4 Mechanical anisotropy of soft rock laboratory testing 4.1 Experimental set-ups and methods 4.2 Experimental results 4.2.1 Ultrasonic velocity 4.2.2 Uniaxial tests 4.2.3 Triaxial compression tests 4.2.4 Triaxial extension tests 4.2.5 Isotropic compression tests 4.2.6 Elastic parameters 4.2.7 Oedometric tests 4.3 Yield surface 4.4 Microstructural analysis 4.5 Flow directions 4.6 Concludingremarks 5 Simulation of mechanical anisotropy 5.1 Transverse isotropic elasticity 5.2 Anisotropic plasticity 5.3 Numerical calculation with ABAQUS 5.3.1 Plane stress calculations 5.4 Concluding remarks 6 Hydromechanical behaviour of soft rock laboratory testing 6.1 Experimental set-ups and methods 6.1.1 Set-up for triaxial testing 6.1.2 Set-up for oedometric testing 6.1.3 Set-up for axial and radial permeability measurement 6.2 Drained triaxial tests 6.3 Drained oedometric tests 6.4 Permeability variation 6.5 Thin section 6.6 The effect of grain breakage on the permeability 6.7 Discussion 7 Simulation ofhydromechanical response 7.1 Simple analytical model 7.2 Validation with experimental results 7.3 Numerical calculation with ABAQUS 7.3.1 Stability requirements 7.3.2 Calibration of the model 7.3.3 Numerical calculation of an oedometer test as BVP 7.4 Discussion 8 Numerical simulation of a reservoir exploitation 8.1 Numerical model 8.2 Analysis of the results 8.3 General discussion 9 Summary - Zusammenfassung
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  • 4
    Call number: S 24.89834(184)
    In: Veröffentlichungen des Institutes für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT), Heft 184
    Type of Medium: Series available for loan
    Pages: iv, 168 Seiten , Illustrationen, Diagramme , 21 cm
    ISSN: 04533267
    Series Statement: Veröffentlichungen des Institutes für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT) Heft 184
    Language: English
    Note: Dissertation, Fakultät für Bauingenieur-, Geo- und Umweltwissenschaften des Karlsruher Instituts für Technologie (KIT), 2017 , 1 Introduction 1.1 Motivation 1.2 Outline 1.3 Notation 2 Implementation of a user-defined finite element in Abaqus/Standard 2.1 Introduction 2.2 Description of the two phase mixture 2.3 Kinematics 2.4 Basic equations 2.4.1 Conservation of mass 2.4.2 Balance of momentum 2.5 Strong form of the governing equations 2.6 Weak form of the governing equations 2.7 Finite element discretisation 2.7.1 Axisymmetric analysis 2.7.2 Plane strain analysis 2.8 Time discretisation and solving procedure 2.9 Numerical integration 2.10 User-defined element and contact 2.10.1 Definition und discretisation of contact surfaces 2.10.2 Contact conditions 2.11 Visualisation of computational results 2.12 Numerical verification of the user-defined element 2.12.1 Spherically symmetric boundary value problem 2.12.2 Strip footing boundary value problem 2.13 Closing remarks 3 FE-modelling of the effects of vibratory pile driving in saturated soil 3.1 Summary 3.2 Introduction 3.3 Boundary value problem 3.3.1 Geometry and mesh discretisation 3.3.2 Boundary conditions 3.3.3 Constitutive model for the soil 3.3.4 Initial conditions 3.3.5 Absorbing boundaries 3.3.6 Calculation schema and parameters for the numerical simulations 3.3.7 Small stress correction and viscous stresses 3.4 Numerical results 3.4.1 Mean effective stress 3.4.2 Evolution of stress and pore pressure 3.4.3 Total mean stress amplitude 3.4.4 Soil displacements 3.5 Consideration of penetration effects using a zipper-type model 3.5.1 Numerical results 3.6 Closing remarks 4 Vibration-induced stress changes in saturated non-cohesive soil: a 'pile-wall' problem 4.1 Introduction 4.2 Formulation of the boundary value problem 4.2.1 First boundary value problem 4.2.2 Second boundary value problem 4.3 Constitutive models for the soil 4.3.1 High cycle accumulation model 4.3.2 Linear elastic model 4.4 Numerical implementation of the boundary value problem 4.5 Validation of the coupling algorithm 4.6 Parameters for the calculations and discretisation of the 'pile-wall' problem 4.7 Numerical results 4.8 Closing remarks 5 Numerical simulation of pile installation in model tests 5.1 Introduction 5.2 Experimental modeling 5.2.1 Model test concept 5.2.2 From half to full model problem 5.3 Constitutive model and soil parameters 5.4 Simplified Finite Element Model 5.5 Observations from FE simulations 5.6 Comparison of FE-and experimental results 5.7 Enhanced FE model 5.8 Comparison of numerical and experimental results 5.8.1 Hypoplasticity and cyclic triaxial element tests 5.9 Closing remarks 6 Numerical simulation of pile installation in model tests including large penetration effects 6.1 Introduction 6.2 Concept of model tests 6.3 Test material, constitutive model and soil parameters 6.4 Numerical model 6.5 Comparison of FE- and experimental results 6.6 Closing remarks 7 Summary - Zusammenfassung 7.1 Summary 7.2 Zusammenfassung Bibliography Appendix A A.1 Hypoplastic constitutive model for the soil Appendix B
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  • 5
    Call number: 10.1144/sp519
    In: Geological Society special publication, 515
    Description / Table of Contents: Volcanic islands have a highly characteristic geological context that poses specific issues related to thereconstruction of volcanic activity, hazard assessment, risk management, implementation of monitoringnetworks, and non-eruptive geohazards as landslides. This special publication intends to address theseissues from a multidisciplinary point of view.
    Type of Medium: 12
    Pages: 1 Online Ressource (170 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 9781786205650 , 978-1-78620-565-0
    ISSN: 03058719 , 0305-8719
    Series Statement: Geological Society special publication 519
    Language: English
    Note: Griffiths, J. S. and Law, R. D. Introduction to SP519 – volcanic islands: from hazard assessment to risk mitigation Multidisciplinary approaches to understanding volcanic islands Della Seta, M., Esposito, C., Fiorucci, M., Marmoni, G. M., Martino, S., Sottili, G., Belviso, P., Carandente, A., de Vita, S., Marotta, E. and Peluso, R. Thermal monitoring to infer possible interactions between shallow hydrothermal system and slope-scale gravitational deformation of Mt Epomeo (Ischia Island, Italy) Marotta, E., Berrino, G., de Vita, S., Di Vito, M. and Camacho, A. G. Structural setting of the Ischia resurgent caldera (southern Tyrrhenian Sea, Italy) by integrated 3D gravity inversion and geological models Tramelli, A., Orazi, M., Nardone, L., Bobbio, A., Benincasa, A., Buonocunto, C., Capello, M., Caputo, A., Castellano, M., D’Auria, L., De Cesare, W., Di Filippo, A., Galluzzo, D., Gaudiosi, G., Giudicepietro, F., Liguoro, F., Lo Bascio, D., Martini, M., Martino, C., Peluso, R., Ricciolino, P., Scarpato, G., Torello, V. and Bianco, F. The seismic network of Ischia island from 1993 to 2021 Longo, M., Lazzaro, G., Caruso, C. G., Corbo, A., Sciré Scappuzzo, S., Italiano, F., Gattuso, A. and Romano, D. Hydro-acoustic signals from the Panarea shallow hydrothermal field: new inferences of a direct link with Stromboli Musacchio, M., Silvestri, M., Rabuffi, F., Buongiorno, M. F. and Falcone, S. Kılauea ̄ –Leilani 2018 lava flow delineation using Sentinel2 and Landsat8 images Tsunamis from volcanic environments Zaniboni, F., Pagnoni, G., Gallotti, G., Tinti, S. and Armigliato, A. Landslide-tsunamis along the flanks of Mount Epomeo, Ischia: propagation patterns and coastal hazard for the Campania Coasts, Italy Fornaciai, A., Favalli, M. and Nannipieri, L. Reconstruction of the 2002 tsunami at Stromboli using the non-hydrostatic WAVE model (NHWAVE) Volcanoes and society Lotteri, A., Speake, J., Kennedy, V., Wallenstein, N., Coutinho, R., Chester, D., Duncan, A., Dibben, C. and Ferreira, F. Changing hazard awareness over two decades: the case of Furnas, São Miguel (Azores) Tomasone, M., Avvisati, G., Cirillo, F., Colucci, O., Marotta, E., Fiorenza, E., Vertechi, E. and Simonetti, B. Risk management planning on a volcanic island: fear and loathing in Ischia (Italy) Index
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  • 6
    Call number: M 17.90874 ; S 24.89834(183)
    In: Veröffentlichungen des Institutes für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT) ; Heft 183
    Type of Medium: Monograph available for loan
    Pages: v, 224 Seiten , Illustrationen
    Series Statement: Veröffentlichungen des Institutes für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT) Heft 183
    Classification:
    Engineering
    Language: English
    Location: Upper compact magazine
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  • 7
    Call number: M 19.92946 ; S 24.89834(185)
    In: Veröffentlichungen des Institutes für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT), 185
    Type of Medium: Dissertations
    Pages: vi, 194 Seiten , Illustrationen
    ISSN: 0453-3267
    Series Statement: Veröffentlichungen des Institutes für Bodenmechanik und Felsmechanik am Karlsruher Institut für Technologie (KIT) 185
    Language: English
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  • 8
    Monograph available for loan
    Monograph available for loan
    New York, NY : Humana Press
    Call number: im Bestellvorgang
    Type of Medium: Monograph available for loan
    Pages: xi, 247 Seiten , Illustrationen
    ISBN: 9781493997206
    Series Statement: Methods in molecular biology 2046
    Language: English
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  • 9
    Call number: im Bestellvorgang
    Type of Medium: Monograph available for loan
    Pages: 272 Seiten , 128 x 196 mm
    ISBN: 9781800812222
    Language: English
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  • 10
    Monograph available for loan
    Tokyo [u.a.] : Center for Academic Publications
    Associated volumes
    Call number: Im Bestellvorgang
    In: Developments in earth and planetary sciences, 4
    Type of Medium: Monograph available for loan
    Pages: XII, 348 Seiten , Illustrationen
    ISBN: 9027713456
    Series Statement: Developments in earth and planetary sciences 4
    URL: Cover
    URL: Inhaltsverzeichnis  (kostenfrei)
    Language: English
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