Spoiler自埋技术特点及其在杭州湾海底管道运行情况分析

Features of self-embedding technology of spoiler and operation analysis of submarine pipeline in Hangzhou Bay

海底管道阻流板(Spoiler)自沉埋技术是一种新型管道自埋技术,为深入了解其作用机制及其效果,本文通过分析安装有阻流板的杭州湾海底管道历年检测资料,结合管道附近海域海床、潮流动力特性,深入探讨了阻流板装置在实际工程中的运行效果,分析了其作用机制及其适用条件。研究发现安装阻流板装置的杭州湾海底管道在往复潮流作用下逐渐埋入海床,其埋入段长度由2005年的50%增加到2013年的80%以上,而且平均埋入深度超过2.6m,自埋效果较好;而在管道路由与海流平行段或管道敷设于抗冲刷强海床上时,阻流板作用不能有效发挥,管道仍然呈现裸露状态。

Attaching a spoiler on the top of pipeline is a new method to enhance self-burial of pipeline.The pipeline state in Hangzhou Bay with spoiler was investigated in this study in order to understand the mechanism of spoiler.Based on the route survey data combined with the seabed and hydrodynamic characteristics,the effect of spoiler on self-burial of pipeline was discussed.The survey data illustrate that the percentage of buried pipeline increased from 50%in 2005 to over 80%in 2013,and the average buried depth increased to 2.60 m,which shows that this self-burial method is applicable in this region.While some sections of the pipeline where the flow direction is parallel to the route or on strong anti-erosion river bed are still exposed on the seabed due to the ineffectiveness of spoiler.