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Research on The Calculation of Seepage Force on buried Pipeline in Shallow Water

DOI：

 作者 单位 E-mail 付长静 重庆交通大学 nhri_fuchangjing@163.com 李国英 南京水利科学研究院 赵天龙 重庆交通大学 neo_3303@qq.com

我国海上油田开采起步较晚，大部分油田处于浅水区，因此针对我国国情，在设计管道时，应充分考虑由浅水区波浪引起的管道周围海床渗流力。根据浅水波相关假设，考虑自由水面非线性影响，推导出椭圆余弦波的波面方程，并在此基础上进一步给出一阶近似椭圆余弦波波动方程，最后得出作用于海床表面的波压公式。考虑海床土的压缩性，推导出一阶近似椭圆余弦波作用下浅水区埋置管道周围海床的渗流压力解析解，最后将计算结果与大型水槽试验及以往研究成果作对比。结果表明，在椭圆余弦波的作用下，由一阶椭圆余弦波理论得到的计算结果与试验结果规律基本一致，与相似工况下的现有理论成果数值基本相同，具有一定的可行性和工程价值。

China in the development of offshore oil fields later than other countries, most oil fields in shallow waters, due to the effect caused by the nonlinear shallow wave, the nonlinear wave load has a great influence on the pipelines buried shallow. The study of the stability of submarine pipelines need to give full consideration to the characteristics of the shallow water waves. Because the total vertical wave force acting on the pipeline is one of the main environmental load, we should take full account of the wave force which caused by the shallow water waves in the beginning of the pipeline design in our country. Taken pore water and compressibility of the seabed soil into consideration, and based on Biot consolidation theory and the first-order approximate elliptical cosine wave theory, seepage force caused by nonlinear wave around buried pipelines in shallow water was derived by the way of variables separation, and the analytic solution of wave force around buried pipelines was proposed, and the solution was compared with test result. The calculating results showed that the seepage force around buried pipelines assumed a Sine distribution under the effect of cnoidal wave, and the conclusion agreed well with the experiment results. The theory model has certain feasibility and engineering value.
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