地基边界条件对自升式生产平台结构安全评估的影响分析

Analysis of Influence of Foundation Boundary Conditions on Structural Safety Evaluation of Jack-up Production Platforms

自升式生产平台已被应用于开发边际油田,其结构安全备受关注。建立某自升式生产平台的结构分析模型,分别计算铰支约束和考虑土壤等效刚度2种边界条件下平台的受力状态、位移和桩腿的UC值(承载能力与使用要求之比),详细分析计算结果的差异性:铰支约束的设定虽偏于保守,但其对应的桩腿整体应力分布与实际情况存在较大偏差,而考虑土壤等效刚度能够更加真实地反映桩腿的实际受力状态,可为平台的优化设计和维修保养提供参考。

The jack-up production platforms have gradually been applied to the development of marginal oil fields,and their structural safety has been concerned.The structural analysis model of a jack-up production platform is established,and the stress state,displacement and UC values of the legs(ratio of bearing capacity to service requirements)of the platform under the two boundary conditions of hinge constraint and considering soil equivalent stiffness are calculated respectively.The differences in the calculated results are analyzed.Although the setting of the hinge constraint is conservative,the corresponding stress distribution of the legs has a large deviation from the actual situation.The setting of soil equivalent stiffness constraint can more truly reflect the actual stress state of the legs,so as to provide reference for the optimization design and maintenance of the platform.