海底管道失稳过程的模型试验研究

Experimental research on the instability process of submarine pipelines

直接铺设于砂质海床上的管道的失稳是一“流—管—土”耦合问题。本文利用U形水槽产生的振荡流对管道的失稳过程进行了模拟 ,通过改变管道水下重量、管径和加载历史研究管道失稳的条件。在试验结果的基础上 ,初步得到了管道失稳的临界Fr数与管重无量纲参数之间的关系曲线 。

The instability of pipelines directly installed on the seabed is a “fluid-pipe-soil”coupling problem .In this paper , the instability process of pipelines has been investigated for different submerged weight of pipeline , pipeline diameter and loading history . Based on the presently available test data , a design equation is established , relating the critical Fr number inducing pipeline instability to dimensionless pipeline weight parameter .It is also found that different loading history affects pipeline stability with different degree.