Theoretical and experimental investigation of the multiaxial soil response around monopile foundations

Alessandro Mandolini, Andrea Diambra, Erdin Ibraim

Research output: Contribution to conferenceConference Paper

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Abstract

Large diameter monopiles are still the preferred foundation method for offshore wind farm developments. The performance of the pile under cyclic lateral load is the leading design criterion for this foundation option. In order to investigate the cyclic response of the soil surrounding the pile, it is simplistically assumed that soil elements located in the direction of pile loading are subjected to axisymmetric triaxial loading, while those on the side of the pile are subjected to simple shear loading conditions. Conversely, by setting up a 3-D finite element analysis for a hollow cylinder driven pile, this paper will investigate the real multiaxial (6-D) stress paths induced in soil elements around the pile. It will be shown how the stress paths change according to (i) the orientation of the soil element with respect to the pile loading direction, (ii) the depth of the soil element from the ground surface and (iii) the lateral distance of the soil element from the pile. It will be found that most of the soil elements (even those in front and on the side of the pile) will follow a multiaxial stress path, with continuous orientation of principal stress axis. This research will then develop guidance on which experimental apparatus and loading conditions can be imposed to satisfactorily approximate the loading history experienced by each soil element. Differently from common practice, the necessity of using multiaxial stress equipment (e.g. the hollow cylinder torsional apparatus) will be demonstrated. Examples of real experimental tests and test results under the loading conditions representative of laterally loaded pile will be also shown.
Original languageEnglish
Number of pages8
DOIs
Publication statusPublished - 6 Sep 2019
EventEuropean Conference on Soil Mechanics and Geotechnical Engineering - Reykjavik, Iceland
Duration: 1 Sep 20196 Sep 2019
Conference number: 27
https://www.ecsmge-2019.com/

Conference

ConferenceEuropean Conference on Soil Mechanics and Geotechnical Engineering
Abbreviated titleECSMGE-2019
CountryIceland
CityReykjavik
Period1/09/196/09/19
Internet address

Keywords

  • Multiaxial stress
  • Hollow cylinder Torsional apparatus
  • Sands
  • Cyclic loading

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    Mandolini, A., Diambra, A., & Ibraim, E. (2019). Theoretical and experimental investigation of the multiaxial soil response around monopile foundations. Paper presented at European Conference on Soil Mechanics and Geotechnical Engineering, Reykjavik, Iceland. https://doi.org/10.32075/17ECSMGE-2019-0839