Change search
ReferencesLink to record
Permanent link

Direct link
Backcalculation of Plate Loading Tests using PLAXIS 2D and the Hardening Soil Model
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Civil and Transport Engineering.
2013 (English)MasteroppgaveStudent thesis
Abstract [en]

Shallow foundations are extensively used to support structures of all sizes in order to safely transmit the structural load to the ground without exceeding the bearing capacity of the ground and causing excessive settlement. They are typically embedded up to a few meters into the soil profile. While designing foundations, two requirements need to be satisfied: complete failure of the foundation must be avoided with adequate margin of safety (bearing capacity) and relative settlement should be within limits that can be tolerated by superstructure. Foundation is that part of the structure which is in direct contact with soil and involves the footing and the ground influenced by the footing. The master thesis aims to back-calculate the load tests using advanced soil models in PLAXIS 2D in order to gather experience on soil behavior and constitutive models. For this, extensive study of literature with full-scale load tests was carried out. Both tests on clay and sand were the theme interest. To examine the plate-load tests, three case studies were selected. In this report, the load-settlement responses of vertically loaded footings placed on both sands and clay were analysed using the finite element method. The numerical analysis was performed using PLAXIS 2D. The soil profiles and parameters used in the analysis were based on either in situ tests or laboratory tests. The Hardening Soil model was used as a material model to analyse the soil behavior. Finally, the load-settlement curves obtained from finite element analysis were compared with those from plate-load tests and see whether they are well fitted. The first case study was on clay till from Sweden. In this case, the back-calculated results showed that c_ref^' = 11.45 to 14.45 kPa and ɸ = 300. The second case was in saprolitic soil from Portugal. In this case, c_ref^' = 8 to 13 kPa and ɸ = 370 to 380. The third case was on sand from USA. In this case, sand shows some varying behavior in stiffness. The stiffness from laboratory tests and back-calculated vary by a factor of 3 to 8. The angle of friction was from 360 to 390.

Place, publisher, year, edition, pages
Institutt for bygg, anlegg og transport , 2013. , 162 p.
URN: urn:nbn:no:ntnu:diva-23328Local ID: ntnudaim:9375OAI: diva2:661114
Available from: 2013-10-31 Created: 2013-10-31 Last updated: 2013-10-31Bibliographically approved

Open Access in DiVA

fulltext(14291 kB)32965 downloads
File information
File name FULLTEXT01.pdfFile size 14291 kBChecksum SHA-512
Type fulltextMimetype application/pdf
cover(184 kB)20 downloads
File information
File name COVER01.pdfFile size 184 kBChecksum SHA-512
Type coverMimetype application/pdf

By organisation
Department of Civil and Transport Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 32965 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 146 hits
ReferencesLink to record
Permanent link

Direct link