Numerical study of anisotropic permeability effects on undrained CPTu penetration

Laurin Hauser, Lluís Monforte, Helmut Schweiger, Marcos Arroyo

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Abstract

The numerical simulation of Cone Penetration Tests (CPT) is a challenging field
in geotechnics. Both the underlying physical model and the numerical method need to be capable of
taking into account large deformations and displacements within the problem domain. Researchers at
the Polytechnic University of Catalonia (UPC) and the International Center for Numerical Methods in
Engineering (CIMNE) have developed a Particle Finite Element Method (PFEM) code named G-PFEM
which conducts fully coupled analysis of penetration problems in saturated porous media. An updated
Lagrangian description is used in order to formulate the governing equations. The PFEM is based on
frequent remeshing of critical regions of the problem domain adding additional computational cost to the
solving process. Therefore, the use of linear elements in combination with a stabilized mixed formulation
of the governing equations helps to reduce the computational effort and at the same time cope with the
phenomenon of volumetric locking associated with linear elements. Within the present work, anisotropic
permeability is introduced and tested by means of consolidation of an elastic soil layer. Furthermore,
recalculations of an available in-situ CPT are performed allowing the examination of the influence of
changing boundary conditions, such as anisotropic permeability of the soil or penetration velocity of the
cone, on the measured tip resistance, sleeve friction and pore water pressure. It was found that the recalcu-
lation with G-PFEM provides comparable results for undrained conditions and anisotropic permeability.
Original languageEnglish
Title of host publicationCone Penetration Testing 2018
Subtitle of host publicationProceedings of the 4th International Symposium on Cone Penetration Testing
EditorsMichael A. Hicks, Federico Pisanò, Joek Peuchen
Place of PublicationLondon
PublisherCRC Taylor & Francis
Pages329 - 334
ISBN (Electronic)9780429000485
Publication statusPublished - 2018
Event2018 International Symposium on Cone Penetration Testing - Delft, Netherlands
Duration: 21 Jun 201822 Jun 2018

Conference

Conference2018 International Symposium on Cone Penetration Testing
Abbreviated titleCPT '18
CountryNetherlands
CityDelft
Period21/06/1822/06/18

Cite this

Hauser, L., Monforte, L., Schweiger, H., & Arroyo, M. (2018). Numerical study of anisotropic permeability effects on undrained CPTu penetration. In M. A. Hicks, F. Pisanò, & J. Peuchen (Eds.), Cone Penetration Testing 2018: Proceedings of the 4th International Symposium on Cone Penetration Testing (pp. 329 - 334). London: CRC Taylor & Francis.

Numerical study of anisotropic permeability effects on undrained CPTu penetration. / Hauser, Laurin; Monforte, Lluís; Schweiger, Helmut; Arroyo, Marcos.

Cone Penetration Testing 2018: Proceedings of the 4th International Symposium on Cone Penetration Testing . ed. / Michael A. Hicks; Federico Pisanò; Joek Peuchen. London : CRC Taylor & Francis, 2018. p. 329 - 334.

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Hauser, L, Monforte, L, Schweiger, H & Arroyo, M 2018, Numerical study of anisotropic permeability effects on undrained CPTu penetration. in MA Hicks, F Pisanò & J Peuchen (eds), Cone Penetration Testing 2018: Proceedings of the 4th International Symposium on Cone Penetration Testing . CRC Taylor & Francis, London, pp. 329 - 334, 2018 International Symposium on Cone Penetration Testing, Delft, Netherlands, 21/06/18.
Hauser L, Monforte L, Schweiger H, Arroyo M. Numerical study of anisotropic permeability effects on undrained CPTu penetration. In Hicks MA, Pisanò F, Peuchen J, editors, Cone Penetration Testing 2018: Proceedings of the 4th International Symposium on Cone Penetration Testing . London: CRC Taylor & Francis. 2018. p. 329 - 334
Hauser, Laurin ; Monforte, Lluís ; Schweiger, Helmut ; Arroyo, Marcos. / Numerical study of anisotropic permeability effects on undrained CPTu penetration. Cone Penetration Testing 2018: Proceedings of the 4th International Symposium on Cone Penetration Testing . editor / Michael A. Hicks ; Federico Pisanò ; Joek Peuchen. London : CRC Taylor & Francis, 2018. pp. 329 - 334
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AB - The numerical simulation of Cone Penetration Tests (CPT) is a challenging fieldin geotechnics. Both the underlying physical model and the numerical method need to be capable oftaking into account large deformations and displacements within the problem domain. Researchers atthe Polytechnic University of Catalonia (UPC) and the International Center for Numerical Methods inEngineering (CIMNE) have developed a Particle Finite Element Method (PFEM) code named G-PFEMwhich conducts fully coupled analysis of penetration problems in saturated porous media. An updatedLagrangian description is used in order to formulate the governing equations. The PFEM is based onfrequent remeshing of critical regions of the problem domain adding additional computational cost to thesolving process. Therefore, the use of linear elements in combination with a stabilized mixed formulationof the governing equations helps to reduce the computational effort and at the same time cope with thephenomenon of volumetric locking associated with linear elements. Within the present work, anisotropicpermeability is introduced and tested by means of consolidation of an elastic soil layer. Furthermore,recalculations of an available in-situ CPT are performed allowing the examination of the influence ofchanging boundary conditions, such as anisotropic permeability of the soil or penetration velocity of thecone, on the measured tip resistance, sleeve friction and pore water pressure. It was found that the recalcu-lation with G-PFEM provides comparable results for undrained conditions and anisotropic permeability.

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