基于耦合欧拉-拉格朗日法的井口吸力锚竖向承载力的分析  

Analysis on the Vertical Bearing Capacity of Anchorage Foundations with Wellhead Suction Anchors Based on CEL Method

作　　者：孙凯 李博[1] 寇贝贝 宓雨琪 李晶 李彬 马会环 SUN Kai;LI Bo;KOU Beibei;MI Yuqi;LI Jing;LI Bin;MA Huihuan(Guangzhou Marine Geological Survey,China Geological Survey,Guangzhou 510075,China;School of Civil Engineering,Sun Yat-Sen University,Zhuhai 519082,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,China)

机构地区：[1]中国地质调查局广州海洋地质调查局,广州510075 [2]中山大学土木工程学院,广东珠海519082 [3]南方海洋科学与工程广东省实验室(珠海),广东珠海519000

出　　处：《工业建筑》2023年第6期25-30,共6页Industrial Construction

基　　金：广州海洋地质调查局科技项目(2021C-15-89);广西防灾减灾与工程安全重点实验室开放课题基金资助(2020ZDK002)。

摘　　要：我国第二轮天然气水合物试采试验首次运用了井口吸力锚基础。针对井口吸力锚基础,采用有限元法开展竖向荷载作用下受力机理的研究。通过建立的基础三维模型,采用耦合欧拉-拉格朗日方法模拟了井口吸力锚基础竖向大变形的过程。经与不同承载力计算理论的对比,验证了耦合欧拉-拉格朗日方法分析井口吸力锚极限承载力的有效性。对比分析传统吸力锚和井口吸力锚的竖向位移-荷载曲线特征,发现井口吸力锚内部土塞受侧壁约束较大,其竖向极限承载力较高。建立的耦合欧拉-拉格朗日模型为井口吸力锚基础的优化设计提供有益的参考。The wellhead suction anchor has been first used in the second round of trial production tests for natural gas hydrates in China.Be directed against anchorage foundations with wellheed suction anchors,the mechanism of the foundation under vertical loads was studied.The three-dimensional model of the foundation was constructed by finite element software,and the coupled Euler-Lagrangian(CEL) method was used to simulate the vertical large-deformation process of the foundation.The validity of the CEL method for analyzing the ultimate bearing capacity of the wellhead suction anchor was verified by comparing the numerical analysis results with the theoretical calculation results.By comparing between the characteristics of vertical displacement-load curves of traditional suction anchors and wellhead suction anchors,it was found that the side wall serionsly confined the soil plug inside wellhead suction anchors,and its vertical ultimate bearing capacity was higher.The model coupled the Euler-Lagrangian method provided reference to the optimal design of anchorage foundations with wellhead suction anchors.

关 键 词：井口吸力锚 竖向承载力 耦合欧拉-拉格朗日分析法 大变形模拟 土塞 

分 类 号：TE53[石油与天然气工程—油气田开发工程] P75[天文地球—海洋科学]