摘要
应用沉箱保护水下生产系统时,海底管线和沉箱间跨接管与沉箱内部的管汇采用的往往是刚性连接,一旦沉箱基础位移超过设计允许值将会使管汇与外部管缆变形不协调,严重时将导致管线断裂并发生漏油等重大工程事故。通过耦合的欧拉-拉格朗日(CEL)方法采用ABAQUS有限元软件建立霍尔锚紧急落锚对水下沉箱位移影响的计算模型,在与模型试验结果对比验证数值模型可靠性的基础上,模拟了贯入速度区间为6~22m/s、落锚间距为1~5倍锚长的102组不同工况下船舶落锚过程对水下沉箱位移的影响。结果表明,水下沉箱位移随锚贯入速度的增大而增大,随落锚距离增大而减小。根据数值计算结果和影响因素分析,提出了水下沉箱位移的预测方法和不同贯入速度下安全落锚距离的计算表达式。
When applying caisson protection to underwater production systems,the rigid connection between subsea pipelines,cross connecting pipe and the caisson’s internal manifolds often leads to a lack of coordination between the piping and external cables when the caisson’s foundation displacement exceeds the allowable design value.In severe cases,this can result in major engineering accidents such as pipeline rupture and oil leakage.By employing the coupled Euler-Lagrange(CEL)method and using ABAQUS finite element software,a computational model is established to analyze the impact of Hall anchor emergency anchoring on the displacement of submerged caissons.Based on the comparison with experimental results and the validation of the numerical model’s reliability,the study simulates 102 different cases of ship anchoring processes,considering penetration velocities ranging from 6 to 22 m/s and anchoring distances ranging from 1 to 5 times the anchor length.The results indicate that the displacement of submerged caissons increases with increasing anchor penetration velocity and decreases with increasing anchoring distance.Based on the numerical calculation results and factor analysis,a prediction method for caisson displacement and a calculation expression for the safe anchoring distance under different penetration velocities are proposed.
作者
王忠畅
李书兆
王丽勤
王忠涛
鲁金全
WANG Zhongchang;LI Shuzhao;WANG Liqin;WANG Zhongtao;LU Jinquan(CNOOC Research Institute Ltd.,Beijing 100028,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116023,China)
出处
《海洋工程》
CSCD
北大核心
2024年第4期177-187,共11页
The Ocean Engineering
基金
国家自然科学基金资助项目(41772296)。
关键词
霍尔锚
落锚距离
水下生产系统
沉箱位移
深海油气
Hall anchor
anchoring distance
subsea production system
caisson displacement
deep-sea oil and gas
