Acta Geotechnica

, Volume 12, Issue 1, pp 195–209 | Cite as

Numerical study of partially drained penetration and pore pressure dissipation in piezocone test

Research Paper

Abstract

The piezocone penetration test (CPTU) is commonly used as a fast and economical tool to identify soil profile and to estimate relevant material properties in soils ranging from fine to coarse-grained. Moreover, in the case of fine-grained soils (clays and silts), the consolidation coefficient and the permeability can be estimated through the dissipation test. Undrained conditions are commonly assumed for the interpretation of CPTU in fine-grained soils, but in soils such as silts, penetration may occur in partially drained conditions. This aspect is often neglected in data interpretation thus leading to an inaccurate estimate of soil properties. This paper investigates numerically the effect of partial drainage during penetration on the measured tip resistance and the subsequent pore pressure dissipation response contributing to a more accurate interpretation of field data. A realistic simulation of the cone penetration is achieved with the two-phase Material Point Method, modelling the soil response with the modified Cam-Clay model. The approach takes into account large soil deformations induced by the advancing cone, soil–water, and soil–structure interactions, as well as nonlinear soil behavior.

Keywords

CPTU Dissipation test MPM Partial drainage 

Notes

Acknowledgments

The authors wish to express their gratitude to the MPM research group at Deltares, Delft, The Netherlands for the support during this work. Special thanks go to Prof. Pieter Vermeer, Dot. Lars Beuth, and Dot. Issam Jassim, for their help, without which this study would have been much more difficult.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.University of PadovaPaduaItaly

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