Numerical and experimental study on influence of installation effects on behaviour of helical anchors in very dense sand

The use of helical anchors has been increasing in recent years; however, the current understanding of its behaviour does not allow for reliable estimates of uplift capacity and load–displacement response. The need for improvement of the design methods has motivated the present study, which investiga...

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Bibliographic Details
Published in:Canadian geotechnical journal 2018-08, Vol.55 (8), p.1067-1080
Main Authors: Pérez, Zorany Agudelo, Schiavon, José Antonio, Tsuha, Cristina de Hollanda Cavalcanti, Dias, Daniel, Thorel, Luc
Format: Article
Language:English
Subjects:
Anchors
ancrages hélicoïdaux
Capacity
Centrifuge model
centrifuge model tests
Centrifuges
Civil Engineering
Computer simulation
Displacement
effet d’installation
Engineering Sciences
essais sur modèle centrifuge
Finite difference method
helical anchors
installation effect
Mathematical models
Model testing
modélisation numérique
numerical modelling
Numerical models
Numerical prediction
Parametric analysis
Properties
sable
Sand
Sands
Soil
Tests
Uplift
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Summary:The use of helical anchors has been increasing in recent years; however, the current understanding of its behaviour does not allow for reliable estimates of uplift capacity and load–displacement response. The need for improvement of the design methods has motivated the present study, which investigates the effect of installation on the helical anchor response in very dense sand. This work is divided into three parts. The first part describes the results of centrifuge model tests and microtomographic analysis performed to examine the uplift response of a single-helix anchor and the soil disturbance caused by the installation process. The aim of these tests was to define appropriate hypotheses for the numerical prediction of helical anchor performance. In the second part, the load–displacement curve of a tested helical anchor was numerically simulated with the finite difference software FLAC 3D , considering the installation effect observed experimentally. In the third part of the paper, the adjusted numerical model was used in a parametric analysis to provide some guidelines for the design of helical anchors in dense sand. Additionally, from the results of the numerical investigation and experimental observations, two different approaches are presented for improving the accuracy of analytical predictions of helical anchor capacity. Both suggested methods showed good agreement with centrifuge and field testing data.
ISSN:0008-3674
1208-6010
DOI:10.1139/cgj-2017-0137