地震和波流作用下海底悬跨管线模型实验研究

Model Experimental Research on the Spanning Submarine Pipelines Subjected to Combined Actions of Wave,Current and Earthquake

利用水下地震-波流联合模拟实验系统研究了海底管线在波浪、水流和地震作用下的动态响应特征。实验中考虑了有无地震作用、悬跨长度、波浪高度、水深、水流速度以及是否满管状态等因素。通过DDP动态数据后处理软件对实验结果进行处理分析,得到海底悬跨管道的动态响应特性。实验结果表明:在浅海海域,悬跨管线的动态反应受波浪及水深变化的影响不明显,悬跨长度是影响管道动态响应的主要影响因素;悬跨管线在地震与波流共同作用下的反应与仅地震作用下的应变存在差别;在波浪力作用下,空管时管线的应变要小于满管时的情况。

Dynamic response characteristics of free spanning submarine pipelines subjected to combined actions of wave, current and earthquake were experimentally studied based on a underwater earthquake-wave and current combined simulation experimental system. In experiment, factors such as with or without earthquake, the spanning length, the wave height, the water depth, the current speed and the pipe state （whether full or not） are all taken into account. The dynamic response characteristics of free spanning submarine pipelines were obtained through processing and analyzing experimental results by using DDP dynamic data processing software. Experimental results show that in shallow waters, dynamic response of spanning pipelines is not obviously affected by wave height and water depth. The spanning length is the key impact factor for pipelines dynamic response. The response of free spanning pipeline due to wave and current action also differs from that due to earthquake action. The pipeline strain of empty pipelines is less than that of full pipelines due to wave effect.