桩土效应与地震对自升式平台动力响应影响分析

以某400英尺自升式钻井平台为研究对象,建立了相应的三维有限元分析模型,综合考虑风浪流包括地震等环境载荷和桩土效应的影响,对风暴自存状态下自升式钻井平台的响应进行了分析,通过比较传统的铰支模型和基于Winkler地基梁的桩土相互作用模型,并叠加地震波的作用,结果表明,传统的铰支模型计算结果偏于保守,考虑了桩土效应后,平台的最大侧向位移有所降低。同时,地震对平台的响应分析结果影响较大,叠加地震波后平台的水平向位移最大值增大幅度在60%以上,且不同的桩基模型考虑地震后增大的幅度也不一样。

Influence analysis of pile-soil effect and seismic action on dynamic response of jack-up

The three-dimensional finite element model of 400 foot jack-up was built up for research ob-ject. The influence of environmental loads including wind, wave, flow, seismic, etc and the effect of pile-soil interaction were considered in dynamic response analysis of jack-up under storm survival condition. The results of articulated foundation model and pile-soil model which based on Winkler foundation theory are compared, and the effect of seismic is also obtained by adding environmental loads which includes the earthquake wave.The following conclusions may be drawn. The results calculated by articulated model trend to be conservative, the maximum lateral displacement of platform is reduced after considering the effect of pile-soil interaction. Meanwhile, The seismic has a great impact on the response analysis of platform, the increasing amplitude of maximum lateral displacement is larger than 60%, and different results are obtained by two pile foundation models after considering the seismic.