Numerical investigation of pile installation effects in sand using material point method |
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| Institution: | 1. Section of Geo-engineering, Department of Geoscience & Engineering, Faculty of Civil Engineering and Geoscience, Delft University of Technology, Delft, The Netherlands;2. Deltares, Delft, The Netherlands;1. Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK;2. College of Engineering and Informatics, National University of Ireland, Galway, University Road, Galway, Ireland;1. Chair of Geotechnics Weimar, Bauhaus University Weimar, Germany;2. Institute of Soil Mechanics and Rock Mechanics (IBF), Karlsruhe Institute of Technology (KIT), Germany;1. DICEA – University of Padua, via Ognissanti 39, 35129 Padua, Italy;2. Deltares, Delft, The Netherlands;1. Marine and Land Geotechnics and Geomechanics, Institute for Geoscience, Kiel University, Ludewig–Meyn–Str. 10, 24321 Kiel, Germany;2. Faculty of Science, Charles University in Prague, Albertov 6, 12843 Prague 2, Czech Republic;1. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;2. Research Institute of Civil Engineering and Mechanics (GeM), UMR CNRS 6183, Ecole Centrale de Nantes, Nantes, 44321, France;3. University of Lyon, INSA Lyon, Laboratoire GEOMAS, Villeurbanne 69621, France;1. Institute of Continuum Mechanics, Leibniz Universität Hannover, Germany;2. Institute of Applied Mechanics, Technische Universität Braunschweig, Germany |
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| Abstract: | The installation of displacement piles in sand leads to severe changes in the stress state, density and soil properties around the pile tip and shaft, and therefore has a significant influence on the pile bearing capacity. Most current numerical methods predicting pile capacity do not take installation effects into account, as large deformations can lead to mesh distortion and non-converging solutions. In this study, the material point method (MPM) is applied to simulate the pile installation process and subsequent static pile loading tests. MPM is an extension of the finite element method (FEM), which is capable of modelling large deformations and soil-structure interactions. This study utilizes the moving mesh algorithm where a redefined computational mesh is applied in the convective phase. This allows a fine mesh to be maintained around the pile tip during the installation process and improves the accuracy of the numerical scheme, especially for contact formulation. For the analyses a hypoplastic constitutive model for sand is used, which takes into account density and stress dependent behaviour. The model performs well in situations with significant stress level changes because it accounts for very high stresses at the pile tip. Numerical results agree with centrifuge experiments at a gravitational level of 40 g. This analysis confirms the importance of pile installation effects in numerical simulations, as well as the proposed numerical approach’s ability to simulate installation and static load tests of jacked displacement piles. |
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| Keywords: | Geotechnical engineering Pile installation effects Large deformation Material point method Hypoplastic model |
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