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Microstructural study of the deformation zones around a penetrating coned tip in silty soil

Paniagua, P., Gylland, A. S., Nordal, S. and Fonseca, J. (2015). Microstructural study of the deformation zones around a penetrating coned tip in silty soil. In: Soga, K., Kumar, K., Biscontin, G. and Kuo, M. (Eds.), Geomechanics from Micro to Macro. (pp. 1593-1598). London, UK: CRC Press. ISBN 9781138027077


The change in soil microstructure around the penetrating probe during a cone penetration test is investigated. Backscattered electron images of polished thin sections prepared from frozen samples at the end of penetration are used. The images have a spatial resolution of 0.4 µm/pixel that allow a clear identification of grains and pore spaces. The statistical distribution of the change of particles orientation is analyzed for the zones around the cone tip and the shaft. Quantitative analysis of the change in porosity near the penetrating object is investigated. An increase in porosity and a decrease in the anisotropy of particle orientations from the cone and further out confirm that the soil deformation during CPTU in silt is a combination of compaction and dilative behavior that might influence the pore pressure distribution during penetration.

Publication Type: Book Section
Additional Information: Accepted Manuscript of a book chapter published by Routledge in Geomechanics from Micro to Macro on 26 Aug 2014, available online:
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: School of Mathematics, Computer Science & Engineering > Engineering
Text - Accepted Version
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