轴线倾斜海底管道冲刷速率试验研究  

Scour propagation rate of a tilting subsea pipeline in steady current

作　　者：张凯兵 娄晓帆 王菲菲 ZHANG Kaibing;LOU Xiaofan;WANG Feifei(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;R&D Center of Hydro-ecology and Smart Water Technology,Research Institute of Tsinghua,Pearl River Delta,Guangzhou 510530,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]清华珠三角研究院水生态与智慧水利技术研发中心,广东广州510530

出　　处：《海洋工程》2023年第2期50-61,共12页The Ocean Engineering

基　　金：国家自然科学基金青年基金资助项目(51909028);国家自然科学基金重大项目课题资助项目(51890913)。

摘　　要：通过物理模型试验研究水流作用下轴线倾斜海底管道的三维局部冲刷问题。利用超声波探头监测管道下部冲刷沿管轴线方向的扩展过程,分析海底管道三维局部冲刷的动态发展机理。由模型沙的冲蚀试验,建立沙床面剪切应力与泥沙表观侵蚀速率之间的关系式,并引入经验公式对沙床面剪切应力放大系数、泥沙表观侵蚀速率以及远场床面剪切应力之间的关系进行表达。由倾斜管道模型试验,在分析冲刷扩展位置随时间变化数据的基础上,结合上述经验公式以及沙床面剪切应力放大系数与管道埋深的关系,建立轴线倾斜海底管道冲刷扩展速率的预测公式。The three-dimensional local scour around an axis-tilting subsea pipeline in steady current was investigated using physical model experiment.A group of ultrasound doppler velocimetry sensors were employed to measure the initiation and propagation of the scour,focusing on the dynamic development mechanism.Firstly,through sediment erosion test on the model sand,a function of sand bed shear stress and the apparent sediment erosion rate was established.Also,an empirical function was applied to describe the relation among the amplifying factor of sand bed shear stress,apparent sediment erosion rate and the shear stress of the sand bed in far field.Secondly,the scour propagation with respect to time was recorded in the water flume test on a tilting pipeline model.By analysis on the scour progress,together with the aforementioned empirical function and the relation between the amplifying factor of sand bed shear stress and the pipeline embedment,a prediction function was proposed for the scour propagation rate of a tilting pipeline.

关 键 词：倾斜管道 局部冲刷 冲刷速率 模型试验 剪切应力放大系数 管道埋深 

分 类 号：P756[天文地球—海洋科学]