3D Numerical and Experimental Modelling of Installation Effects of Driven Piles (10189)

Project nummer: 10189

Omschrijving van het onderzoek

Current methods for the calculation of the bearing capacity of foundation piles do not include the specific behaviour during installation and the interaction between the pile and the soil. Moreover, the change of soil properties during installation are not taken into account, because these effects are not known in detail. Nevertheless, this information is essential to make better predictions of the pile bearing capacity, as well as the influence of the pile installation on adjacent structures.
Purpose of this research project is to investigate the installation effects of driven piles and to translate this into practical numerical models. In order to achieve this, state-of-the-art numerical and experimental research methods are being used.
The research consists of a fundamental experimental component, a fundamental numerical component and an applied numerical component. The fundamental experimental component focuses on 1g and centrifuge scale model tests to investigate the change of soil properties (like densification and stress changes) during pile installation. The fundamental numerical component will investigate these effects using numerical methods. Large deformations (Updated Lagrange, ALE, Material Point Method) as well as advanced constitutive models (stress-, stress path, strain- and density-dependent strength and stiffness of the soil) are key issues. The applied numerical component develops models for friction fatigue en grain crushing, which will be added to the constitutive model for soil. As soon as the results from the fundamental components are available, these will be translated into the embedded pile concept and other numerical models for practical application.
The results of this research project will become applicable for the design of pile foundations in the engineering practice by means of robust implementation in the finite element method (a.o. Plaxis). Potential users of the new models are civil engineers with a geotechnical or foundation engineering specialization, working in local and federal government agencies, design offices and geotechnical consulting firms, which are involved in the design, construction, maintenance and retrofit of pile foundations.

Gebruikers

Six companies are involved in this project.

Projectleider

Prof. ir. A.F. van Tol
Technische Universiteit Delft
Faculteit Civiele Techniek en Geowetenschappen
Geotechniek
Postbus 5028
2600 GA Delft

Status van het project

Startdatum:	01-03-2008
Einddatum:	28-02-2011

Trefwoorden

Driven piles, Installation effects, Soil behaviour, Centrifuge tests, Finite element method, Embedded piles.

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