R. B. J. Brinkgreve

Delft University of Technology | TU · Department of Geoscience and Engineering

The use of Artificial Intelligence (AI) and Machine Learning (ML) have significantly increased over the last couple of years. ML is driven by the availability of data. Although geotechnical en-gineering is generally not among the first in picking up new technologies, there is a lot of data in our profession, and therefore, lots of opportunities to...

In-situ testing has numerous applications in geotechnical engineering. The interpretation of in-situ test results includes soil stratification and determination of soil parameters. This paper presents an automated parameter determination framework that aims to determine constitutive model parameters based on in-situ tests. The ongoing research proj...

The use of soil data is essential in geotechnical design, but in a preliminary project phase such data are usually limited to that inferred from field tests, like CPT, SPT or DMT. In previous publications by the authors and co-workers, it was shown how such data can be automatically processed into soil profiles and parameter sets for geotechnical f...

Following up on previous research on Automated Parameter Determination (APD), in which the soil stratification and numerical model parameters are automatically derived from individual CPTs, this article describes ongoing research in which the geotechnical modelling workflow is further automated in a BIM / Digital Twin environment. Especially in a p...

Single large diameter piles, known as monopiles, are, nowadays, the most common foundation type for offshore wind turbines (OWT). Several research initiatives have been focusing on improving the conventional design practice. The PISA (Pile Soil Analysis) joint industry research project resulted in a proposal for a new design methodology for OWT pil...

While reliability methods have already been widely adopted in civil engineering, the efficiency and robustness of finite element-based reliability assessments of quay walls are still fairly low. In this paper, the reliability indices of structural and geotechnical failure modes of two real-life quay walls are determined by coupling probabilistic me...

Finite Element Analysis of serviceability limit states (SLS) and bearing capacity (ULS) of piled foundations involves the modelling piles in the soil, including pile-soil interaction. Embedded beams are an efficient way to model multiple piles for complex practical applications. Following initial work of Sadek & Shahrour (2004) on embedded beam ele...

This paper describes an implementation of the methodology, developed in Phase 2 the recent PISA (PIle Soil Analysis) joint industry research project, for the design of laterally-loaded monopiles in layered soils. The software PLAXIS MoDeTo and PLAXIS 3D are employed to obtain the soil reaction curves that are required for the method, following the...

When saturated soils are subjected to an earthquake, the excess pore pressures increase, and, in the case of sands, this may cause liquefaction. To simulate the behaviour of saturated sands under cyclic loading, the PM4Sand constitutive model (version 3.1) formulated by Boulanger & Ziotopoulou (2017), is used. The PM4Sand model represents an improv...

Offshore wind turbine generators (WTG) are commonly founded on single largediameter piles, named monopiles. These monopiles are subjected to significant lateral loads and thereby sizeable overturning bending moments mainly due to action of wind and wave forces; thus the critical geotechnical design situation for monopiles supporting WTGs is often r...

The PISA (PIle Soil Analysis) joint industry research project resulted in a proposal for a new design methodology for pile foundations of offshore wind turbines, focusing on laterally-loaded monopiles, with length-to-diameter (L/D) ratios between 2 and 6. The proposed methodology defines a one-dimensional (1D) model, based on the use of Timoshenko...

PLAXIS MoDeTo manual contents: - General information - Reference manual - Tutorial - Scientific manual

The ever increasing demand for new transport routes led to the need of improving the current Naples underground system. It is actually composed by 7 lines connecting most of the suburban areas of the Neapolitan environment to the city center. Line 6 is one of the under construction lines of the system. Although the digging operations are still in p...

The recently-completed PISA (PIle Soil Analysis) research project aimed to improve the design of monopile foundations for offshore wind turbines (OWT), focusing on laterally-loaded monopiles with length-to-diameter (L/D) ratios between 2 and 6. The project resulted in a novel one-dimensional (1D) design model which overcomes certain limitations in...

The recently-completed PISA (PIle Soil Analysis) research project aimed to improve the design of monopile foundations for offshore wind turbines (OWT), focusing on laterally-loaded monopiles with length-to-diameter (L/D) ratios between 2 and 6. The project resulted in a novel one-dimensional (1D) design model which overcomes certain limitations in...

The PISA (PIle Soil Analysis) research project resulted in a proposal for a new design methodology for monopile foundations of offshore wind. This paper demonstrates the capabilities of a new application called MoDeTo (Monopile Design Tool), developed as a satellite tool of the Finite Element (FE) software PLAXIS. PISA primary results are integrate...

A constitutive model for granular materials which considers grain crushing effects is developed in the framework of hypoplasticity. As grain crushing occurs the behaviour of granular material can usually be significantly affected. Several empirical relations between peak strength, uniformity coefficient and stiffness of sand depending on stress lev...

In this paper, a constitutive model for masonry structures is presented. It is based on the Jointed Rock (JR) model with overall Mohr-Coulomb (MC) failure criterion, and it is implemented as a user-defined soil model in the finite element code PLAXIS. The Masonry model is a linear elastic-perfectly plastic model capable of simulating the macroscopi...

This paper presents a simplified finite element analysis technique, the ‘Press-Replace’ technique, to model pile penetration problems in geotechnical engineering, particularly, pile jacking. The method is employed in standard finite element analysis software. The method involves a straining and a consequent geometry update phase. First, a cone pene...

This paper presents a novel technique to describe the installation effects around a jacked pile without simulating the penetration process. With the proposed technique, a jacked pile can be modelled as wished-in-place, and corresponding installation effects, such as stress and density change, can be imposed. In order to obtain a trend for parameter...

The iterative solution of large systems of equations may benefit from parallel processing. However, using a straight-forward domain decomposition in “layered” geomechanical finite element models with significantly different stiffnesses may lead to slow or non-converging solutions. Physics-based domain decomposition is the answer to such problems, a...

The following link provides free access to the article, and is valid until 19th March, 2015 http://authors.elsevier.com/a/1QS6q8g9LU6f- Granular anchors (GAs) can resist pullout/uplift forces, compression forces and also provide ground improvement. Under pullout loading, a centrally located tendon transmits the applied surface load to the base of...

İnşa edilen bir kazık etrafındaki zemin dayanımı ve rijitliği kazık inşa yöntemine bağlı olarak büyük farklılıklar gösterebilmektedir. Bu çalışmada kazık penetrasyonunun etkilerinin önemi ve pratik bir yaklaşım olan 'Press-Replace (PR)' (Bas-Değiştir) yöntemiyle nümerik olarak modellenmesi irdelenmiştir. Ayrıca bu yöntem kullanılarak farklı kazık ç...

Numerical aspects of seismic liquefaction in soils as implemented in the finite element code, PLAXIS, is described in this paper. After description of finite element equations of dynamic problems, three practical dynamic boundary con ditions, namely viscous boundary tractions, tied degrees of freedom and free field elements are reviewed. Possibilit...

aBstract: this paper presents a comparison of two anisotropic creep models, acM and creep-sclaY1, which differ in their formulation of creep strain rate. creep is formulated in acM using the concept of contours of constant volumetric creep strain rate, whereas the newly developed creep-sclaY1 model uses the concept of a constant rate of visco-plast...

Due to the desire of reducing the embedded co2 in construction and the pressure in public finances to get more value for money in big infrastructure projects, the demands for the accuracy of deforma- tion predictions increase. Instead of piling, alternative environmentally friendly and cost effective solutions, such as preloading via surcharge, ver...

The installation process of a displacement pile causes a considerable amount of soil displacement and high levels of stresses, and therefore alters the soil state and properties around the pile. These installation effects may have important consequences on the performance of the pile in its service life (e.g. load-displacement behaviour) and on the...

This paper presents a non-local approach to regularise the strain softening behaviour of a Drucker-Prager constitutive model. Here the non-local plasticity is considered based on weighted average of total strains,instead of plastic strains, taken from neighbouring material points. This method significantly decreases the computational time which inc...

In this study installation effects of a jacked pile in sand is modelled using a simplified finite element technique: The ‘Press-Replace’ technique. The main goal is to find out a trend of installation effects by modelling the jacking by piece-wise updated geometry and discarding distortion problems. To model sand Hypoplasticity with intergranular s...

This paper shows the comparison of two anisotropic models: an advanced rotational hardening model that accounts for both inherent and plastic strain induced anisotropy (S-CLAY1) and the Sekiguchi-Ohta model which accounts for inherent anisotropy only. In the paper, two-dimensional behaviour of a benchmark embankment on soft soils is modelled with t...

It is previously shown that driven piles can be modelled using regular FEA by introducing volumetric expansion or applying displacement or stress fields at pile shaft and tip in order to capture initial stresses near pile. In this paper, these techniques are employed to model piles driven in sand using Plaxis 2D software. The hypoplastic model with...

The right selection of soil model parameters is essential to make good predictions in geo-engineering projects where the Finite Element Method (FEM) is used. In order to support geotechnical engi-neers with soil model parameter selection, empirical formulas have been developed to derive the model para-meters of the Plaxis Hardening Soil model with...

The embedded pile model consisting of beam elements with non-linear skin and tip interfaces is developed in Plaxis 3D Foundation to describe the pile-soil interaction in an efficient manner. The interaction between the pile and the surrounding soil at the pile shaft is described by means of embedded interface elements. At the pile tip, the soil res...

Analytical and numerical solutions of the elastodynamic problem of an instantaneous strip load on a half space are presented and compared. The analytical solution is obtained using the De Hoop–Cagniard method, and the numerical solution is obtained using the dynamic module of the finite element package Plaxis. The purpose of the paper is to validat...

Embedded pile model - consisting of slender beams, skin and foot interfaces - has been successfully implemented in the Plaxis 3D Foundation Program. The interfaces represent the interaction at the contact surface between the pile and soil. Rigid/flexible connection and slippage at the pile-soil contact surface can be modelled by choosing appropriat...

https://wenku.baidu.com/view/106297b91a37f111f1855b0b.html

Undrained instability in geomaterial can be observed either due to the shear induced pore pressure or due to the instantaneous loss of cohesion. Shear induced pore pressure can be a crucial factor to govern the strain softening behaviour of the geomaterial but not essentially a real material (cohesion or frictional angle) softening itself. Hence co...

This paper shows the results of a study in which the new Plaxis Hardening Soil model with small-strain stiffness (HSsmall) was analyzed with respect to its hysteretic damping characteristics for dynamic applications. An analytical expression was derived to formulate the local damping ratio as a function of the local shear strain. Results are shown...

This paper presents the development of a computationally efficient finite element tool for the analysis of 3D steady state heat flow in geothermal heating systems. Emphasis is placed on the development of finite elements for vertical borehole heat exchangers and the surrounding soil layers. Three factors have contributed to the computational effici...

The advancement of a tunnel boring machine in the ground has been numerically modelled using a phased excavation scheme. Special attention is given to the possibilities and limitations of numerical modelling of the tunnel boring process and the influence of soil stiffness. The method has been applied to a situation where tunnel boring may lead to d...

The advancement of a tunnel boring machine in the ground has been modelled using a phased excavation scheme, including the slurry support at the shield face, the conicity of the shield and the grouting at the shield tail. A comparison is made with field measurements obtained at the Second Heinenoord Tunnel. Also calculations are made including a ro...

Since 1960, researchers have been working on constitutive models for geomaterials, i.e. soil and rock. In later years such models have been applied in finite element codes, in particular the simple elastoplastic Mohr-Coulomb model. More refined models exist, but they are not easily applied in practical geotechnical engineering. Even well-known Cam-...