超大异型沉管隧道管节远距离海上拖航技术研究

Analysis of Offshore Towage Technique for Ultra Large and Irregular Tunnel Segment

为解决超大异型沉管隧道管节长距离海上拖航过程中的稳性、运动响应及浅水吸底减小干舷等问题,提出利用静水力及水动力数值模拟计算方法,以2019年1月投入使用的香港中环湾仔绕道项目的超大异型沉管管节远距离海上拖航为例,研究了超大异形管节的拖航完整与破舱稳性、运动响应及浅水吸底情况,并据此分析得到最优拖航方案。超大异形管节拖航过程的浮态、稳性、运动响应及浅水吸底等数值模拟结果与工程实际数据十分吻合,验证了该方法的有效性,研究结果可为类似超大异形管节长距离海上拖航分析提供参考。

In order to solve the problems of stability,motion response and shallow water absorption to reduce the freeboard during long-distance sea towing of the super-large irregular-shaped immersed tunnel segment,a numerical simulation method using hydrostatic and hydrodynamic numerical simulation is proposed.Taking the long-distance offshore towing of the super-large irregular immersed tube section of the Hong Kong Central-Wan Chai Bypass Project that was put into service in January 2019 as an example,the towing integrity and damage stability of the super-large special-shaped tube section,the stability of the damage,the motion response and the shallow water suction.According to the analysis,the optimal towing plan is obtained.Numerical simulation results of floating state,stability,motion response and shallow water bottom suction during the towing process of the super-large special-shaped pipe section are very consistent with the actual engineering data,which verifies the effectiveness of the method.The research results can provide reference for similar sea towage analysis on the long-distance of the super-large specialshaped tube section.