海底悬跨管道在波流和地震联合作用时的模型试验研究

Experimental Research on Dynamic Response Characteristics of Spanning Pipes Under the Combined Effect of the Earthquake Wave Flow

利用波浪-水流-地震联合模拟试验系统,研究了在波浪、水流和谐波地震荷载单独作用或联合作用时海底悬跨管道的动态响应特征。通过试验采集的加速度和动水压力数据分析了管道的悬跨长度、管内状态、外界荷载组合对于管道基频以及动力响应的影响规律。结果表明:随着悬跨长度的增加,管道自振频率减小且管道的动力响应显著增大;水流流速、波浪高度和周期在一定范围的增大会引起管道动力响应增大;三种荷载联合作用于管道时的动力响应大于荷载单独作用,且地震荷载起主要作用,波浪、水流荷载起次要作用。

Submarine pipeline is called lifeline engineering of offshore oil field which is the most economical and efficient way to transport oil and gas resources. In this paper dynamic response characteristic of spanning submarine pipelines subjected to combined actions of wave,current and earthquake were experimentally analyzed based on a underwater earthquake-wave and current combined simulation experimental system. In this experiment factors such as the span length,the pipe state（ whether full or not）,different load combination and the different load factor are all taken into account. The dynamic response characteristics of free spanning sub-marine pipelines were obtained through processing and analyzing the acceleration and dynamic water pressure data collected by experiment. Experimental results show that with the increase of the span length,the natural vibration frequency of the pipeline decreases and the dynamic response increases significantly. The increase of flow velocity,wave height and period in a certain range will increase the dynamic response. The dynamic re-sponse of three kinds of load combination acting on the pipeline is greater than load acting separately. The earthquake load plays a leading role,and the wave and current load play a minor role.