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首页> 外文期刊>Australian Geomechanics >PREDICTING THE LOAD-DISPLACEMENT RESPONSE OF A MOBILE JACK-UP DRILLING RIG ON SAND1
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PREDICTING THE LOAD-DISPLACEMENT RESPONSE OF A MOBILE JACK-UP DRILLING RIG ON SAND1

机译：预测Sand1上的移动式自升式钻井平台的载荷-位移响应

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Before a mobile jack-up drilling rig is approved to be deployed at an offshore location, a site specific assessment is required to be carried out to show the rig's capacity to withstand the design storm conditions. The wind, waves and current acting on the structure in addition to its self-weight result in complex loading applied to the foundations, which must be properly understood if the behaviour of the structure is to be correctly predicted. This paper discusses the foundation loads and benchmarks predictive models currently available. Jack-up load paths (up to ultimate failure) were obtained from experiments on a scaled model rig carried out in the beam centrifuge facility at the University of Western Australia. Compared to the experimental measurements, it is shown that the current guidelines SNAME (2002) are excessively conservative in predicting failure of the jack-up. Numerical modelling with the currently available models, however, achieved a good prediction of the experimental response, both in terms of ultimate failure and stiffness under working loads. Instead of running computationally expensive finite element analyses with the soil being modelled using continuum elements, the footing-soil interaction in the numerical analyses presented here is encapsulated into a point element, which is attached to the bottom nodes of the structural model. Numerical predictions of the experimentally measured response is shown for different loading directions of the jack-up, illustrating the implications of the footing load paths for the overall response of a jack-up to failure. The results show the ability of existing models to predict the load-displacement behaviour of jack-up foundations and their importance in predicting the overall response of the system.
机译：在批准将移动式自升式钻井平台部署到海上位置之前，需要进行针对特定地点的评估，以显示该平台能够承受设计风暴条件的能力。除了自身的重量外，作用在结构上的风，浪和电流还导致施加到基础的复杂载荷，如果要正确预测结构的行为，则必须正确理解。本文讨论了当前可用的基础荷载和基准预测模型。自升载荷路径（直至最终破坏）是从在西澳大利亚大学的光束离心机设施中进行的比例模型试验获得的。与实验测量值相比，结果表明，当前的准则SNAME（2002）在预测自升式起重机的故障时过于保守。然而，使用当前可用的模型进行数值建模，无论是在极限载荷还是在工作载荷下的刚度方面，都可以很好地预测实验响应。取代使用连续统元素对土壤进行建模而进行的计算昂贵的有限元分析，此处呈现的数值分析中的基础-土壤相互作用被封装到一个点元素中，该点元素被附加到结构模型的底部节点上。显示了针对自升式升降机的不同加载方向的实验测量响应的数值预测，说明了基础载荷路径对自升式升降机对故障的整体响应的影响。结果表明，现有模型能够预测自升式地基的荷载-位移行为，并且它们在预测系统的整体响应中也很重要。

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