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Design of plate and screw anchors in dense sand

Design of plate and screw anchors in dense sand
Design of plate and screw anchors in dense sand
Plate and screw anchors provide a significant uplift capacity and have multiple applications in both onshore and offshore geotechnical engineering. Uplift design methods are mostly based on semi-empirical approaches assuming a failure mechanism, a normal and a shear stress distribution at failure and empirical factors back-calculated against experimental data. However, these design methods are shown to under- or overpredict most of the existing larger scale experimental tests. Numerical FE simulations are undertaken to provide new insight into the failure mechanism and stress distribution which should be considered in anchor design in dense sand. Results show that a conical shallow wedge whose inclination to the vertical direction is equal to the dilation angle is a good approximation of the failure mechanism in sand. This shallow mechanism has been observed in each case for relative embedment ratios (depth/diameter) ranging from 1 to 9. However, the stress distribution varies non-linearly with depth, due to the soil deformability and progressive failure. A sharp peak of normal and shear stress can be identified close to the anchor edge, before a gradual decrease with increasing distance along the shear plane. The peak stress magnitude increases almost linearly with embedment depth at larger relative embedment ratios. Although further research is necessary, these results lay the basis for the development of a new generation of design criteria for determining anchor capacity at the ultimate limiting state.
EDP Sciences
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Knappett, Jonathan
cda30027-553d-4310-8a05-e48d8989a545
Brown, Michael
e1e76fc2-6762-4ced-9519-c317bfb606b0
Bradsaw, Aaron S.
bd050242-c7de-49c0-9339-574b8805f246
Tarantino, A
7f462e09-bef9-4490-8853-8d91e31a3f47
Ibraim, E
158a2c95-7527-4620-862e-c9cee274b22a
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Knappett, Jonathan
cda30027-553d-4310-8a05-e48d8989a545
Brown, Michael
e1e76fc2-6762-4ced-9519-c317bfb606b0
Bradsaw, Aaron S.
bd050242-c7de-49c0-9339-574b8805f246
Tarantino, A
7f462e09-bef9-4490-8853-8d91e31a3f47
Ibraim, E
158a2c95-7527-4620-862e-c9cee274b22a

Cerfontaine, Benjamin, Knappett, Jonathan, Brown, Michael and Bradsaw, Aaron S. (2019) Design of plate and screw anchors in dense sand. Tarantino, A and Ibraim, E (eds.) In 7th International Symposium on Deformation Characteristics of Geomaterials (IS-Glasgow 2019). EDP Sciences. 6 pp . (doi:10.1051/e3sconf/20199216010).

Record type: Conference or Workshop Item (Paper)

Abstract

Plate and screw anchors provide a significant uplift capacity and have multiple applications in both onshore and offshore geotechnical engineering. Uplift design methods are mostly based on semi-empirical approaches assuming a failure mechanism, a normal and a shear stress distribution at failure and empirical factors back-calculated against experimental data. However, these design methods are shown to under- or overpredict most of the existing larger scale experimental tests. Numerical FE simulations are undertaken to provide new insight into the failure mechanism and stress distribution which should be considered in anchor design in dense sand. Results show that a conical shallow wedge whose inclination to the vertical direction is equal to the dilation angle is a good approximation of the failure mechanism in sand. This shallow mechanism has been observed in each case for relative embedment ratios (depth/diameter) ranging from 1 to 9. However, the stress distribution varies non-linearly with depth, due to the soil deformability and progressive failure. A sharp peak of normal and shear stress can be identified close to the anchor edge, before a gradual decrease with increasing distance along the shear plane. The peak stress magnitude increases almost linearly with embedment depth at larger relative embedment ratios. Although further research is necessary, these results lay the basis for the development of a new generation of design criteria for determining anchor capacity at the ultimate limiting state.

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More information

Published date: 25 June 2019
Additional Information: This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 753156.

Identifiers

Local EPrints ID: 444207
URI: http://eprints.soton.ac.uk/id/eprint/444207
PURE UUID: 25d677ba-4f29-4628-8568-a99328e5aad1
ORCID for Benjamin Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412

Catalogue record

Date deposited: 01 Oct 2020 16:34
Last modified: 02 Oct 2020 01:53

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Contributors

Author: Jonathan Knappett
Author: Michael Brown
Author: Aaron S. Bradsaw
Editor: A Tarantino
Editor: E Ibraim

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