Two-phase Material Point Method applied to the study of cone penetration |
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| Institution: | 1. DICEA – University of Padua, via Ognissanti 39, 35129 Padua, Italy;2. Deltares, Boussinesqweg 1, 2629 HV Delft, The Netherlands;1. Deltares, Delft, The Netherlands;2. Department of Engineering, University of Cambridge, Cambridge, UK;1. Department of Geotechnical Engineering, Universitat Politècnica de Catalunya – BarcelonaTech, Barcelona, Spain;2. International Center for Numerical Methods in Engineering (CIMNE), Barcelona, Spain;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 |
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| Abstract: | This paper presents numerical simulations of Cone Penetration Test (CPT) in water-saturated soft soils taking into account pore pressure dissipation during installation. Besides modelling interaction between soil skeleton and pore fluid, the problem involves large soil deformations in the vicinity of the penetrometer, soil–structure interaction, and complex non-linear response of soil. This makes such simulations challenging. Depending on the soil’s permeability and compressibility, undrained, partially drained or drained conditions might occur. Partially drained conditions are commonly encountered in soils such as silts and sand–clay mixtures. However, this is often neglected in CPT interpretation, which may lead to inaccurate estimates of soil properties. This paper aims at improving the understanding of the penetration process in different drainage conditions through advanced numerical analyses. A two-phase Material Point Method is applied to simulate large soil deformations and generation and dissipation of excess pore pressures during penetration. The constitutive behaviour of soil is modelled with the Modified Cam Clay model. Numerical results are compared with experimental data showing good agreement. |
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| Keywords: | CPT MPM Rate effects Partial drainage Large deformations Soil–water interaction |
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