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Predicting Long Term Performance of OWT Foundation using Cyclic Simple Shear Apparatus and DEM Simulations

Cui, Liang, Bhattacharya, Subhamoy, Nikitas, Georgios and Vimalan, JN (2017) Predicting Long Term Performance of OWT Foundation using Cyclic Simple Shear Apparatus and DEM Simulations In: Offshore Site Investigation & Geotechnics Committee 8th International Conference: Smarter Solutions for Future Offshore Developments, 12 - 14 Sept 2017, London, UK.

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Under cyclic loading, most soils change their characteristics. Cyclic behaviour (change of shear modulus and accumulated strain) of the RedHill 110 sand was investigated by a series of cyclic simple shear tests. The effects of application of 50,000 cycles of shear loading with different shear strain amplitudes and vertical stresses were investigated. The results correlated quite well with the observations from scaled model tests of different types of offshore wind turbine foundations and limited field observations. Specifically, the test results showed that shear modulus increases rapidly in the initial loading cycles and then the rate of increase diminishes; the rate of increase depends on strain amplitude, initial relative density and vertical pressure. Complementary DEM simulations were performed using PFC2D to analyse the micromechanics underlying the cyclic behaviour of soils. It shows that the change of soil behaviour strongly related to the rotation of principle axes of fabric and degree of fabric anisotropy.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Vimalan, JN
Date : 14 September 2017
DOI : 10.3723/OSIG17.1132
Copyright Disclaimer : Copyright 2017 The Authors
Related URLs :
Depositing User : Melanie Hughes
Date Deposited : 18 Jul 2017 09:57
Last Modified : 23 May 2019 10:23

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