Post-installation pore-pressure changes around spudcan and long-term spudcan behaviour in soft clay |
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| Institution: | 1. Department of Civil & Environmental Engineering, National University of Singapore, Block E1A, #07-03, No. 1 Engineering Drive 2, Singapore 117576, Singapore;2. American Bureau of Shipping, ABS Plaza, 16855 Northchase Drive, Houston, TX 77060, USA;1. Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Songkhla 90110, Thailand;2. Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;1. Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India;2. Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK;1. Centre for Offshore Foundation Systems and ARC CoE for Geotechnical Science and Engineering, University of Western Australia, 35 Stirling Hwy, Crawley, Perth, WA 6009, Australia;2. Faculty of Science, Charles University in Prague, Albertov 3, 128 43 Praha, Czech Republic |
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| Abstract: | This paper presents a dual-stage Eulerian–Lagrangian analysis for modelling the entire process of spudcan installation in soft clay, followed by consolidation and working load operation. The analysis consists of three components, namely undrained effective stress Eulerian analysis of spudcan installation, mesh-to-mesh variable mapping and coupled-flow Lagrangian analysis for the post-installation spudcan working behaviour. The results show good agreement with centrifuge model data but also highlight the importance of replicating the hysteretic behaviour of the soil. The findings also show that while a wished-in-place approach was able to model the long-term bearing response of the spudcan, rotational stiffness was over-estimated. This is due to the fact that, while the wished-in-place analysis was able to model the hardening of the soil ahead of the spudcan, it was unable to model the softening of back-flowed soil behind spudcan. The latter influences the spudcan fixity significantly, but not bearing response. Although the analyses were conducted using ABAQUS, they can, in principle, be conducted using other codes. |
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| Keywords: | Eulerian analysis Coupled-flow Lagrangian analysis Spudcan footing Generation and dissipation of excess pore-pressure Long-term bearing resistance Rotational fixity |
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