A high-cycle accumulation model for clay and its application to monopile foundations

P Staubach, J Machaček, M Tafili, T Wichtmann - Acta Geotechnica, 2022 - Springer
A high-cycle accumulation (HCA) model predicting the accumulation of permanent strain or
excess pore water pressure in clay under a large number of load cycles is presented. Data …

On the automatic parameter calibration of a hypoplastic soil model

J Machaček, P Staubach, CEG Tavera, T Wichtmann… - Acta Geotechnica, 2022 - Springer
This paper presents an approach for the automatic parameter calibration (AC) of a
hypoplastic constitutive soil model. The calibration software developed in this work simplifies …

A state-dependent hyperelastic-plastic constitutive model considering shear-induced particle breakage in granular soils

N Irani, A Lashkari, M Tafili, T Wichtmann - Acta Geotechnica, 2022 - Springer
An elastic–plastic constitutive model considering particle breakage for simulation of
crushable granular soils behavior is proposed. In the model, elastic strain rates are derived …

Monopile installation in clay and subsequent response to millions of lateral load cycles

P Staubach, L Tschirschky, J Machaček… - Computers and …, 2023 - Elsevier
The installation-induced changes in the state of clayey soils caused by pile driving
processes are investigated numerically. Hydro-mechanically coupled Coupled-Eulerian …

[HTML][HTML] A non-linear three-dimensional pile–soil model for vibratory pile installation in layered media

A Tsetas, A Tsouvalas, AV Metrikine - International Journal of Solids and …, 2023 - Elsevier
This paper presents a computationally efficient model for vibratory pile installation. A semi-
analytical finite element (SAFE) model for thin cylindrical shells is derived to represent the …

[HTML][HTML] The mechanics of the Gentle Driving of Piles

A Tsetas, A Tsouvalas, AV Metrikine - International Journal of Solids and …, 2023 - Elsevier
Abstract Gentle Driving of Piles (GDP) is a new vibratory installation technology for tubular
(mono) piles. It is characterized by the simultaneous application of low-frequency axial and …

On the AVISA model for clay–Recommendations for calibration and verification based on the back analysis of a piled raft

M Tafili, A Ganal, T Wichtmann, O Reul - Computers and Geotechnics, 2023 - Elsevier
This paper provides a manual for the thorough calibration of material parameters of the
anisotropic visco ISA (AVISA) model and discusses some of the pitfalls that can arise when …

Clay hypoplasticity coupled with small-strain approaches for complex cyclic loading

G Medicus, M Tafili, M Bode, W Fellin, T Wichtmann - Acta Geotechnica, 2024 - Springer
Constitutive models that are able to accurately predict cyclic soil behaviour are crucial for
finite element design of offshore foundation or railway embankments. Basic hypoplastic …

Repercussion of overshooting effects on elemental and finite-element simulations

M Tafili, J Duque, D Mašín… - International Journal of …, 2024 - ascelibrary.org
This article presents a critical discussion of the repercussion of overshooting effects on
element tests and finite-element simulations. For exemplification purposes, three advanced …

Novel approach to apply existing constitutive soil models to the modelling of interfaces

P Staubach, J Machaček… - International Journal for …, 2022 - Wiley Online Library
A novel scheme to apply constitutive (continuum) soil models to the mechanical modelling of
soil‐structure interfaces is presented. Opposite to existing approaches, all normal stress …