深中通道管节港内系泊动力响应试验研究(Ⅰ:单管节试验)

Experimental study on dynamic response of Shenzhen-Zhongshan Link immersed tunnel element under mooring condition(Part I:single element test)

系泊寄存于港内的待浮运管节在大风大浪等强动力条件下存在系泊安全风险,明晰管节港内系泊动力响应规律对科学评估及优化设计系泊方案、提升系泊安全性具有重要意义。文章以深中通道沉管隧道工程为依托,通过物理模型试验方法,测量了单个管节港内系泊的运动响应及系缆力等参数,系统分析了港内波浪发育规律、不同向波浪对港内泊稳条件影响以及不同类型动力条件下的管节动力响应特征及规律。研究主要结论有:外海波浪作用方向及时长对港内波浪分布及大小影响显著,进而影响系泊管节的动力响应;不同类型动力条件下空载或半载是管节系泊寄存的较不利载况,风是管节系泊动力响应的主控动力因素;风浪联合作用下,管节最显著的运动分量为横移和横摇,且均发生在空载、吹开风叠加波浪作用条件下。

Moored immersed tunnel element in the harbor risks mooring safety under strong dynamic conditions such as strong wind and large waves.It is of great significance to clarify the dynamic response characteristics for scientific evaluation and optimization of mooring system design,and then improvement of mooring safety.Based on the Shenzhen-Zhongshan Link immersed tunnel project,parameters such as motion response and mooring force of the mooring system of single element moored in harbor were obtained by physical model tests.The evolution of waves in the harbor,the influence of waves with different directions on the conditions of mooring stability,as well as the dynamic response characteristics under different dynamic conditions were systematically analyzed.The main conclusions are as follows:The direction and action duration of incident wave significantly affect the distribution and amplitude of waves in the harbor,and then affect the dynamic response of moored tunnel element;Under different dynamic conditions,either no-load or half-load is the unfavorable load condition for mooring stability,and wind is the dominant dynamic factor to mooring dynamic response compared with wave;Under the combined action of wind and wave,the most significant components of tunnel element motion are sway and roll,which get their maximum values under the conditions of no-load with offshore wind superimposed wave.