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

Yaseen Sharif, Michael Brown, Matteo Ciantia, Benjamin Cerfontaine, Craig Davidson, Jonathan Knappett, Gerrit Meijer, Jonathan David Ball

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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.
Original languageEnglish
JournalCanadian Geotechnical Journal
Early online date19 Aug 2020
DOIs
Publication statusE-pub ahead of print - 19 Aug 2020

Keywords

  • Discrete Element Method
  • Piles
  • Cone penetration

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    • Projects

    Development of Screw Anchors for Floating Marine Renewable Energy Systems Arrays Incorporating Anchor Sharing (SAFS) (Joint with University of Liege)

    Brown, M., Cerfontaine, B. & Knappett, J.

    COMMISSION OF THE EUROPEAN COMMUNITIES

    1/08/17 → 31/07/19

    Project: Research

    Supergen Wind Challenge 2015: Screw Piles for Wind Energy Foundation Systems (Joint with Universities of Durham and Southampton)

    Brennan, A., Brown, M. & Knappett, J.

    Engineering and Physical Sciences Research Council

    26/02/16 → 25/07/19

    Project: Research

    Research Output

    Developing screw piles for offshore renewable energy application

    Brown, M. J., Davidson, C., Cerfontaine, B., Ciantia, M., Knappett, J. & Brennan, A., 2020, Advances in Offshore Geotechnics: Proceedings of ISOG2019. Haldar, S., Patra, S. & Ghanekar, R. K. (eds.). Singapore: Springer , p. 101-119 19 p. (Lecture Notes in Civil Engineering; vol. 92).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

    • 99 Downloads (Pure)

    Incorporating surface roughness into DEM models of crushable soils

    Zhang, N., Arroyo, M., Ciantia, M. & Gens, A., 17 Feb 2020, Proceedings of the 5th Itasca Symposium on Applied Numerical Modeling - 2020. Billaux, D., Hazzard, J., Nelson, M. & Schöpfer, M. (eds.). Minneapolis: Itasca International, 4 p. 13-07

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

    Open Access
    File

    • Physical modelling to demonstrate the feasibility of screw piles for offshore jacket supported wind energy structures

    Davidson, C., Brown, M., Cerfontaine, B., Knappett, J., Brennan, A., Al-Baghdadi, T., Augarde, C., Coombs, W. M., Wang, L., Blake, A., Richards, D. & Ball, J. D., 15 Sep 2020, (Accepted/In press) In : Geotechnique.

    Research output: Contribution to journal › Article

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