新型多功能桩基试验系统的研制

桩基稳性对自升式钻井平台作业安全影响很大。国内针对桩基稳性的研究较少,更缺乏相应的试验装置。为此,设计了新型多功能桩基试验系统。该系统可以开展自升式钻井平台插桩、拔桩和穿刺等常见的桩基稳性试验研究,为自升式钻井平台在作业区域插桩深度、拔桩阻力的准确预测以及穿刺机理的深入研究提供了一个良好的试验平台;加装冲桩系统后,还可以开展自升式钻井平台拔桩时的冲桩效果分析和采用冲桩的方式主动穿透硬地层机理研究,扩展了试验系统的功能;能方便、快速地模拟自升式钻井平台作业过程中桩基与海土的相互作用,从而为自升式钻井平台能否到某区域特别是陌生区域作业的快速决策提供有力的技术支持。

Development of the Testing System for Multi-functional Pile Foundation

The stability of pile foundation has great effect on the operating safety of jack-up drilling platform.There is little research on the stability of pile foundation at home and lack of the corresponding test device.Therefore,a new type of multi-functional testing system for pile foundation was designed.The system can conduct the common experimental study of pile foundation stability,such as pile-inserting,pile-pulling and piercing in self-elevating drilling platform,providing a desirable testing platform for the precise prediction of pile-inserting depth and pile-pulling resistance and the intensive study of piercing mechanism.After installation of washing-out pile system,the analysis of pile washing-out effect in pile-pulling in jack-up drilling platform and study of active formation penetration mechanism with washing-out pile can be conducted.Therefore,the function of the testing system is extended.A quick simulation of the interaction between the foundation and the subsea soil in the operating process of the jack-up platform can be carried out.As a result the powerful technological support is provided for determination of whether the jack-up platform can work in some area,especially in strange areas.