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Using DEM to create a CPT based method to estimate the installation requirements of rotary installed piles in sand

Using DEM to create a CPT based method to estimate the installation requirements of rotary installed piles in sand
Using DEM to create a CPT based method to estimate the installation requirements of rotary installed piles in sand
Deep foundations maybe used in a range of soil types where significant foundation resistance is 10 required but their installation is often associated with disturbance due to noise and vibration. Greater restrictions on use in urban and offshore environments is now commonplace. Screw piles and rotary jacked straight shafted piles are two potential methods of silent piling that could be used as alternative foundation solution, but the effects of certain geometric and installation properties such as installation pitch i.e. the ratio between vertical displacement and rotation, on the required installation torque and force in sand are not well understood. In this paper the effects of installation pitch and base geometry on the installation requirements of a straight shafted pile are simulated in 3D using the discrete element method (DEM). The installation requirements of straight shafted piles into sand have been validated against centrifuge testing, in three different relative densities. The DEM shows reductions in installation force can be achieved by increasing the installation pitch or including a conical tip. An existing cone penetration test (CPT) based prediction method for installation requirements has been improved to include the effects of installation pitch and base geometry for rotary installed piles in sand.
Discrete Element Method, Piles, Cone penetration
0008-3674
Sharif, Yaseen
f8ed0802-9644-479f-b288-77dec7624aa8
Brown, Michael
db84010d-8302-4dfc-963c-85f10de704d7
Ciantia, Matteo
a96c5e90-142b-4dae-9369-4c6c54d130d0
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Knappett, Jonathan
cda30027-553d-4310-8a05-e48d8989a545
Meijer, Gerrit
7b9009ee-fc42-434b-82ab-827cf7959e79
Ball, Jonathan David
1baa9903-fa72-4703-ac2c-cdca5498bf8b
Sharif, Yaseen
f8ed0802-9644-479f-b288-77dec7624aa8
Brown, Michael
db84010d-8302-4dfc-963c-85f10de704d7
Ciantia, Matteo
a96c5e90-142b-4dae-9369-4c6c54d130d0
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Knappett, Jonathan
cda30027-553d-4310-8a05-e48d8989a545
Meijer, Gerrit
7b9009ee-fc42-434b-82ab-827cf7959e79
Ball, Jonathan David
1baa9903-fa72-4703-ac2c-cdca5498bf8b

Sharif, Yaseen, Brown, Michael, Ciantia, Matteo, Cerfontaine, Benjamin, Davidson, Craig, Knappett, Jonathan, Meijer, Gerrit and Ball, Jonathan David (2020) Using DEM to create a CPT based method to estimate the installation requirements of rotary installed piles in sand. Canadian Geotechnical Journal. (doi:10.1139/cgj-2020-0017).

Record type: Article

Abstract

Deep foundations maybe used in a range of soil types where significant foundation resistance is 10 required but their installation is often associated with disturbance due to noise and vibration. Greater restrictions on use in urban and offshore environments is now commonplace. Screw piles and rotary jacked straight shafted piles are two potential methods of silent piling that could be used as alternative foundation solution, but the effects of certain geometric and installation properties such as installation pitch i.e. the ratio between vertical displacement and rotation, on the required installation torque and force in sand are not well understood. In this paper the effects of installation pitch and base geometry on the installation requirements of a straight shafted pile are simulated in 3D using the discrete element method (DEM). The installation requirements of straight shafted piles into sand have been validated against centrifuge testing, in three different relative densities. The DEM shows reductions in installation force can be achieved by increasing the installation pitch or including a conical tip. An existing cone penetration test (CPT) based prediction method for installation requirements has been improved to include the effects of installation pitch and base geometry for rotary installed piles in sand.

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More information

e-pub ahead of print date: 19 August 2020
Keywords: Discrete Element Method, Piles, Cone penetration

Identifiers

Local EPrints ID: 444127
URI: http://eprints.soton.ac.uk/id/eprint/444127
ISSN: 0008-3674
PURE UUID: 3d1cdadb-d38c-4092-8c6c-089082e1a42f
ORCID for Benjamin Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412

Catalogue record

Date deposited: 28 Sep 2020 16:33
Last modified: 30 Sep 2020 01:53

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Contributors

Author: Yaseen Sharif
Author: Michael Brown
Author: Matteo Ciantia
Author: Craig Davidson
Author: Jonathan Knappett
Author: Gerrit Meijer
Author: Jonathan David Ball

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