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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 ,并发现不同的加载历史对管道稳定性的影响程度不同
The instability of pipe directly laid on sandy sea bed is a “flow-pipe-soil” coupling problem. In this paper, the instability of the pipeline is simulated by the oscillating flow generated by the U-shaped flume. The conditions of pipeline instability are studied by changing the underwater weight, diameter and loading history of the pipeline. Based on the experimental results, the relationship curve between the critical Fr number of pipe instability and the dimensionless weight of pipe is obtained preliminarily. It is found that the influence of different loading history on the pipe stability is different