Monotonic and cyclic tests on kaolin: a database for the development, calibration and verification of constitutive models for cohesive soils with focus to cyclic loading

Wichtmann, Torsten; Triantafyllidis, Theodoros

doi:10.1007/s11440-017-0588-3

Cited by 79 publications

(112 citation statements)

References 123 publications

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“…In several test series performed by Wichtmann & Triantafyllidis [36], the stress amplitude q 0 , the displacement rate _ s, the initial mean pressure p 0 , the OCR, the initial stress ratio g 0 ¼ q 0 =p 0 and the cutting direction of the samples have been varied as described in [36,37]. Each of these tests has been simulated with the AVISA model and showed a good agreement with the experimental results (see the following sections).…”

Section: Simulations With Kaolin Claymentioning

confidence: 96%

“…Furthermore, experiments show that under undrained triaxial conditions after a stress reversal first an increase in the mean pressure occurs in some clays [36] in contrast to sand where the reversal starts with the highest contractancy. This can also present a reason why most clays do not reach liquefaction p ¼ 0 kPa.…”

Section: Inclusion Of Inherent Anisotropy For Claysmentioning

confidence: 99%

“…The notation of the tests with CXX, e.g. C02 is the same as in [36], so that missing information can be depicted from [36]. The tests C01-C08 was performed with different deviatoric stress amplitudes q ampl ¼ f30; 40; 45; 50; 60; 70g kPa.…”

Section: Simulations With Kaolin Claymentioning

confidence: 99%

“…The performance of the model is finally illustrated in the case of undrained triaxial cyclic simulations of two different clays: the medium plasticity Kaolin Clay and the high-plasticity Lower Rhine Clay. The experiments for the Kaolin Clay are borrowed from [36], whereas the experiments for the Lower Rhine Clay are performed by the authors as will be reported in a subsequent paper. The simulations are carefully analysed regarding the strain rate effects, different overconsolidation ratios, various initial stress ratios and mean pressures and different sample cutting directions.…”

Section: Introductionmentioning

confidence: 99%

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AVISA: anisotropic visco-ISA model and its performance at cyclic loading

Tafili

Triantafyllidis

2020

Acta Geotech.

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In this work, a constitutive model able to capture the strain rate dependency, small strain effects and the inherent anisotropy is proposed considering the influence of the overconsolidation ratio (OCR). Small strain effects are captured by using an extended ISA plasticity formulation (Fuentes and Triantafyllidis in Int J Numer Anal Methods Geomech 39(11):1235-1254, 2015). The strain rate dependency is reproduced by incorporating a third strain rate mechanism (in addition to the elastic and hypoplastic strain rate). A loading surface has been incorporated to define a three-dimensional (3D) overconsolidation ratio and to account for its effects on the simulations. Experimental investigations using Kaolin Clay and Lower Rhine Clay with horizontal bedding plane have shown that under undrained cycles of small strain amplitudes (\10 À4), the effective stress path in the p-q space is significantly inclined towards the left upper corner of the p À q plane. Consequently, a transversely (hypo)elastic stiffness has been successfully formulated to capture this behaviour. The performance of the model has been inspected by simulating the database of approximately 50 cyclic undrained triaxial (CUT) tests on low-plasticity Kaolin Clay (Wichtmann and Triantafyllidis) considering different deviatoric stress amplitudes, initial stress ratios, displacement rate, overconsolidation ratio and cutting direction. Furthermore, 4 CUT tests conducted on high-plasticity Lower Rhine Clay were simulated, whereby the influence of the displacement rate, as well as the deviatoric stress amplitude, has been analysed. The simulations showed a good congruence with the experimental observations.

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Section: Simulations With Kaolin Claymentioning

confidence: 96%

Section: Inclusion Of Inherent Anisotropy For Claysmentioning

confidence: 99%

Section: Simulations With Kaolin Claymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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AVISA: anisotropic visco-ISA model and its performance at cyclic loading

Tafili

Triantafyllidis

2020

Acta Geotech.

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“…The earthquake load applied to the base of models is that of the 1995 Kobe earthquake, i.e., 0.83 g PGA (peak ground acceleration) (as recorded at KJMA station); then, this is scaled down to 0.4 g to investigate the effect of this parameter on the dynamic soil-tunnel behavior. There are various methods [35][36][37][38][39] used for the boundary conditions of models to ensure that these conditions prevent the return of earthquake waves, and we use the viscous spring boundary method to surround our soil models. The acceleration time history of the Kobe earthquake, and the power amplitude and Fourier amplitude spectra used in this study, are presented in Figure 9.…”

Section: Model Descriptionsmentioning

confidence: 99%

Analysis of Undrained Seismic Behavior of Shallow Tunnels in Soft Clay Using Nonlinear Kinematic Hardening Model

Asheghabadi

Cheng

2020

Applied Sciences

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In this study, a soil–tunnel model for clay under earthquake loading is analyzed, using finite element methods and a kinematic hardening model with the Von Mises failure criterion. The results are compared with those from the linear elastic–perfectly plastic Mohr–Coulomb model. The latter model does not consider the stiffness degradation caused by imposing cyclic loading and unloading to the soil, whereas the kinematic hardening model can simulate this stiffness degradation. The parameters of the kinematic hardening model are calibrated based on the results of experimental cyclic tests and finite element simulation. Here, two methods—one using data from cyclic shear tests, and the other a new method using undrained cyclic triaxial tests—are used to calibrate the parameters. The parameters investigated are the peak ground acceleration (PGA), tunnel lining thickness, tunnel shape, and tunnel embedment depth, all of which have an effect on the resistance of the shallow tunnel to the stresses and deformations caused by the surrounding clay soils. The results show that unlike traditional models, the nonlinear kinematic hardening model can predict the response reasonably well, and it is able to create the hysteresis loops and consider the soil stiffness degradation under the seismic loads.

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Validierung des anisotropen visko ISA Modells (AVISA) für bindige Böden

2022

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Das Bauen auf bindigen Böden stellt trotz fortgeschrittener Ausführungstechnologien immer noch eine Herausforderung dar. Vor allem sind die Werkzeuge zur Prognostizierung der Langzeitverformungen des feinkörnigen Bodens beschränkt, wenn es um zyklische Belastungszustände in Verbindung mit dem zeitabhängigen Verhalten bindiger Böden geht. Solche Fragestellungen ergeben sich z. B. bei Offshore‐Konstruktionen oder auch bei Staumauern oder Widerlagern von Brückenkonstruktionen. Aufgrund des komplexen Einflusses der Belastungsrate, der Vorbelastung und der Struktur des Bodens ist es notwendig, die Auswirkungen dieser Einflüsse auf bindige Materialien durch Laborversuche zu verstehen und durch akkurate und physikalisch basierte konstitutive Gleichungen numerisch zu beschreiben.In diesem Aufsatz soll ein neues Modell, entwickelt in der Promotion der Erstautorin, validiert werden. Die Leistung des anisotropen visko ISA Modells (AVISA) wurde bisher an Experimenten verschiedener feinkörniger Böden unter Beweis gestellt. Hier wird eine neue experimentelle Studie an Malaysia Kaolin für die Validierung des Modells benutzt. Außerdem wird die Reproduzierbarkeit der sog. Krey‐und‐Tiedemann‐Parameter , c′ und φ′ durch Simulationen von einfachen Rahmenscherversuchen untersucht.

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Monotonic and cyclic tests on kaolin: a database for the development, calibration and verification of constitutive models for cohesive soils with focus to cyclic loading

Cited by 79 publications

References 123 publications

AVISA: anisotropic visco-ISA model and its performance at cyclic loading

AVISA: anisotropic visco-ISA model and its performance at cyclic loading

Analysis of Undrained Seismic Behavior of Shallow Tunnels in Soft Clay Using Nonlinear Kinematic Hardening Model

Validierung des anisotropen visko ISA Modells (AVISA) für bindige Böden

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