海底输油管道底砂床冲刷机理研究  

Study on the scour mechanism of sandy seabed below submarine pipelines

作　　者：吴钰骅[1] 金伟良[1] 毛根海[2] 张恩勇[3] 粟京[3] 

机构地区：[1]浙江大学结构工程研究所,浙江杭州310027 [2]浙江大学水利与海洋工程学系,浙江杭州310027 [3]中国海洋石油总公司研究中心,北京100027

出　　处：《海洋工程》2006年第4期43-48,共6页The Ocean Engineering

基　　金：国家高技术研究发展计划(863计划)资助项目(2001AA602022-12004AA602210-1)

摘　　要：设计了海底输油管道水槽冲刷试验模型,研究了海底输油管道与砂床处于不同相对位置情况下床砂起动流速的变化,采用理想流体映射定理对其进行了理论分析,探讨起动流速变化规律。结合有限元数值模拟对试验进行细化分析,研究了海底管道底砂床砂粒起动的产生机理,根据研究结果将冲刷过程划分为五个阶段。阐明了海底管道暴露冲刷的危害性和实时监测的重要性。Investigation on initiation of sediment transport is reviewed to design a flume scour model. Experiments are carried out to determine the scour mechanism of sandy seabed below submarine pipelines with different intervals. Theoretical analyses, based on potential-flow theory, are proposed to find the law of the threshoht velocity. Finite element modeling is also proposed to give a refining analysis for the experiments. Then the mechanism of seabed scouring is disused, and scour stages are divided. The hazard of exposure scouring for submarine pipelines is pointed out and monitoring in time is suggested.

关 键 词：泥沙起动 海底输油管道 冲刷机理 理想流体 有限元数值模拟 

分 类 号：TV64[水利工程—水利水电工程]