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Axisymmetric transient modelling of a suction caisson in dense sand

机译：沉井中沉井的轴对称瞬态模拟

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摘要

Suction caisson are hollow cylinders open towards the bottom that are currently used as anchors for deep water offshore facilities. They recently turned out to be advantageously exploited as foundation for offshore wind turbines in shallow water (Senders 2009). The Prevost model for cohesionless soils (Prevost 1985) is currently used for the modelling of their cyclic behaviour. It's able to reproduce plastic deformation in both loading and unloading, contractancy of the soil and pore pressure build up as well. In this paper, a fully-coupled transient axisymmetric analysis of a suction caisson is carried out. A vertical pseudo-random loading is transformed into equivalent ones. Comparison of the permanent displacement accumulated shows a good agreement between them. The influence of the interface conditions is also addressed. For low tension amplitude applied to the caisson, it can be modelled as "stuck" to the inner soil. However higher amplitude might lead to a total unplugging.
机译：吸水沉箱是向底部开口的空心圆柱体，目前用作深水海上设施的锚。事实证明，它们最近被用作浅水海上风力发电机的基础（Senders 2009）。目前，无粘性土的Prevost模型（Prevost 1985）用于其循环行为的建模。它可以在装卸时重现塑性变形，还可以增加土壤的收缩性和孔隙压力。在本文中，对沉箱进行了全耦合瞬态轴对称分析。垂直伪随机加载被转换为等效的。比较累积的永久位移可以看出它们之间有很好的一致性。还讨论了界面条件的影响。对于施加到沉箱的低张力振幅，可以将其建模为“卡在”内部土壤上。但是，更高的幅度可能会导致完全拔出电源。

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  • 会议地点 Delft(NL)
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    B. Cerfontaine; S. Levasseur; F. Collin; R. Charlier;

  • 作者单位

    Geomechanics and Geological Engineering, Department ArGEnCo, University of Liege, Belgium FRIA, FRS-FNRS, National Fund for Scientific Research;

    Geomechanics and Geological Engineering, Department ArGEnCo, University of Liege, Belgium;

    Geomechanics and Geological Engineering, Department ArGEnCo, University of Liege, Belgium;

    Geomechanics and Geological Engineering, Department ArGEnCo, University of Liege, Belgium;

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