Change search
ReferencesLink to record
Permanent link

Direct link
Numerical and Analytical Analysis of Geogrid Reinforced Soil Wall Subjected to Dynamic Loading
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Civil and Transport Engineering.
2012 (English)MasteroppgaveStudent thesis
Abstract [en]

The potential human and economic loss due to structural collapse of geo-synthetic reinforced soil walls during earthquakes us huge. This substantiates the need for reliable design of such structures. The focus of this study was numerical and analytical design geo-synthetic reinforced soil walls under dynamic loading. Two topics were addressed; the effect of reinforcement parameters and verification of pseudo-static methods. The study is based on a 1 m high reduced-scale shaking table model loaded using stepped-amplitude harmonic base acceleration amplitude. A numerical PLAXIS model was developed and verified using physical model data. Material properties of the components (e.g. backfill and reinforcements) were based on information from a similar model developed using FLAC. The numerical model was used in a parameter study of the effects of reinforcement length and strength on the failure surface, facing displacements and reinforcement loads. The accuracy of pseudo-static methods was studied by comparing physical model results with predictions using the Mononobe-Okabe, the horizontal slices and two-part wedge method. Furthermore, guidelines for the Mononobe-Okabe method in different seismic design codes (i.e. Eurocode, FHWA/AASTHO and PIANC) were compared. Based on this comparison a new pseudo-static coefficient was developed. The reinforcement length and strength were found to have a significant effect on model response. For example, an increase in reinforcement axial stiffness will give a shallower failure surface and reduced the lateral facing displacements. Neither the Mononobe-Okabe, nor the horizontal slice, or the two-part wedge method was able to predict both the failure surface and the earth forces for a wide range of acceleration amplitudes. It was found that different pseudo-static methods are suitable for different predictions (e.g. of the failure surface) at different acceleration amplitudes. For example, single wedge pseudo-static methods gave good predictions for the active earth force and failure surface shape for acceleration amplitudes up to 0.30g, but not for higher amplitudes. FHWA/AASHTO were found to give better predictions for the failure surface and earth forced (when using Mononobe-Okabe) than the Eurocode and PIANC guidelines. Even so, the failure surface predicted using FHWA/AASHTO was too shallow compared to the physical measurements for acceleration amplitudes up to 0.30g.

Place, publisher, year, edition, pages
Institutt for bygg, anlegg og transport , 2012. , 102 p.
Keyword [no]
ntnudaim:7870, MTBYGG Bygg- og miljøteknikk, Geoteknikk
URN: urn:nbn:no:ntnu:diva-18803Local ID: ntnudaim:7870OAI: diva2:566278
Available from: 2012-11-08 Created: 2012-11-08

Open Access in DiVA

fulltext(5147 kB)5992 downloads
File information
File name FULLTEXT01.pdfFile size 5147 kBChecksum SHA-512
Type fulltextMimetype application/pdf
cover(184 kB)30 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: 5992 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: 210 hits
ReferencesLink to record
Permanent link

Direct link