“老脚印”对自升式钻井平台插桩滑移的影响研究

Influence of“Old Footprints”on Pile Slip of Self-elevating Drilling Platform

渤海海域自升式钻井平台作业频率高,在同一区块多次插桩作业情况多,为自升式平台插桩作业带来严重的滑移风险。通过建立常用的两种类型桩靴的有限元分析模型,采用模拟计算和对比分析的研究方法,对在"老脚印"不同距离位置插桩时,桩基土体的塑性破坏特性、运移规律及桩靴所受侧向滑移力进行了模拟研究,得出了在不同土质条件下,桩基土和桩靴的受力特性及规律,分析了不同位置的"老脚印"对自升式平台插桩滑移风险的影响。

In view of the high operating frequency of self-elevating drilling platforms in Bohai sea area and many times pile plug-in operation in the same blocks,the original pile holes bring serious slip risk to pile plug-in operation for self-elevating platform.By establishing the finite element analysis model of 2 types of commonly used pile shoes and using the research methods of simulation calculation and comparative analysis,the simulation research is carried out in the plastic failure characteristics of pile foundation soil,the movement law of pile foundation soil and the lateral slip force of the pile shoes while pile plugging in the positions at different distances to the＂old footprints＂,the force characteristics and rules of pile foundation soil and pile shoe under different soil conditions are obtained,and the influence of the＂old footprints＂of different positions on the slip risk of self-elevating platform is analyzed.