可移动自升式平台的桩靴沉放安装研究  

Research on the Penetration of Spudcan Foundation for Mobile Jack-Up Platform

作　　者：潘泽华 刘博 刘东华 PAN Zehua;LIU Bo;LIU Donghua(China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd.,Guangzhou 510663,Guangdong,China)

机构地区：[1]中国能源建设集团广东省电力设计研究院有限公司,广东广州510663

出　　处：《南方能源建设》2023年第1期48-56,共9页Southern Energy Construction

基　　金：中国能建广东院科技项目“海上风电吸力桶基础受力机理与变形控制关键技术研究”(EV04631W)。

摘　　要：[目的]桩靴基础是可移动自升式平台的关键基础结构,在其贯入过程中会排开大量土体。为保证可移动自升式平台在海上风电安装领域的安全应用,研究桩靴沉放过程中周围土体流动模式的演变规律,可靠评估桩靴的贯入阻力尤为重要。[方法]利用耦合的欧拉-拉格朗日(CEL)方法,模拟了桩靴在常见海床地质条件(包括均质黏土、非均质黏土、砂土、“黏土-砂土-黏土”以及“黏土(硬)-砂土(软)-黏土(硬)”)下的安装沉放过程,分析了沉放贯入机理的差异性。[结果]仿真结果表明:桩靴沉放过程中,土体流动机制和桩靴贯入阻力与海床土强度特性密切相关,而桩靴与海床土界面的摩擦系数对桩靴贯入机理和贯入阻力影响不大。[结论]通过与现行设计规范计算结果对比,大变形有限元模拟和规范设计相结合的方法更应该被推荐应用于工程设计实践,以便为桩靴贯入过程中的穿刺风险评价和插桩深度预测提供更好的依据。[Introduction]The spudcan foundation is the key structure of the mobile jack-up platform,which displaces surrounding soil during its penetrating installation.In order to ensure the safety in the application of mobile jack-up platform to the offshore wind power installation works,it is particularly important to research the evolution of surrounding soil flow mechanism during spudcan penetration,and to evaluate the penetration resistance of spudcan reliably.[Method]The coupling Euler-Lagrange(CEL)method was used in this research to simualte the process of spudcan penetration under several typical seabed geological conditions(homogeneous and heterogeneous clay,sand,"clay-sand-clay"and"clay(hard)-sand(soft)and clay(hard)"),and to analyze the differences of penetration mechanisms.[Result]The simulation results show that in the process of spudcan penetration,the soil flow mechanism and penetration resistance of spudcan are closely related to the strength characteristics of seabed soil,while the friction coefficient of the interface between spudcan and seabed soil has little effect on the penetration mechanism and resistance.[Conclusion]From comparision with the results calculated in accordance current design specifications,the method combining large deformation finite element analysis and industry code design should be recommended to be applied in engineering design practice,as to provide a better basis for the assessment of punch-through risk and the prediction of penetrating depth in the process of spudcan penetration.

关 键 词：施工安装 桩靴沉放 大变形有限元 贯入阻力 沉放机理 

分 类 号：TK89[动力工程及工程热物理—流体机械及工程] TU476[建筑科学—结构工程]