Abstract
This paper presents the results of the numerical investigation of the cyclic behaviour of the monopile which has been installed by impact and vibratory driving. By the numerical investigation, two different phases were considered: installation process (phase 1) and lateral cyclic loading (phase 2). In the first phase, a model with MMALE formulation for the simulation of large deformation of soil due to penetration was used. Hereby the impact and vibratory driving were modelled. In the second phase, a model with Lagrangian formulation was used. In this model, an explicit accumulation model (HCA-Model) for the simulation of the long-term cyclic loading was applied. The influences of the installation were considered in the second model in form of the initial condition of the void ratio and stress states after the penetration of the pile which were adapted from the first model. The investigation showed a significant effect of the installation on the behaviour of the pile. In the small scale models, the vibratory pile indicated a stiffer behaviour on the lateral cyclic loading in comparison to the impact driven pile.
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Acknowledgement
The investigation presented was partly supported by INNOGY SE as part of the research project “Cyclic and Near Field Effects of Vibratory Driving in Sand - CAFE”, which is gratefully acknowledged here.
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Le, V.H., Rackwitz, F. (2022). Investigation of the Long-Term Cyclic Behaviour of Monopile Foundation by Impact and Vibratory Installation. In: Huynh, D.V.K., Tang, A.M., Doan, D.H., Watson, P. (eds) Proceedings of the 2nd Vietnam Symposium on Advances in Offshore Engineering. VSOE2021 2021. Lecture Notes in Civil Engineering, vol 208. Springer, Singapore. https://doi.org/10.1007/978-981-16-7735-9_13
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DOI: https://doi.org/10.1007/978-981-16-7735-9_13
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