沉埋式海底隧道管段海上系泊水动力性能分析

沉埋式海底隧道管段海上系泊阶段的结构运动响应及缆索受力,影响其水上施工的安全性和经济性。以一管段系泊工程为例,利用基于三维势流理论的水动力软件AQWA建立管段海上系泊数值仿真计算模型,首先对系泊系统进行频域分析,然后在时域内考虑JONSWAP波浪谱和水流联合作用,研究环境载荷方向、环境载荷组合方式等因素对系统运动响应及缆索受力的影响。结果表明:管段在高频区域内稳定性较好,响应幅值很小;水流对管段的运动响应影响很大;当环境力以60°入射管段时,管段的系泊缆张力最大。

Hydrodynamic performance of immersed subsea tunnel element under mooring condition

The safety and economy of over-water construction are affected by the motion response and mooring performance of immersed subsea tunnel element on the sea.For a mooring project of tunnel element,we establish the numerical simulation model by hydrodynamics simulation software AQWA based on the 3-D potential flow theory and analyze the frequency responses of tunnel element.Considering the JONSWAP wave spectrum and current loads,we analyze the motion response and mooring performance in different directions of the environmental load and combined load.The result shows that the motion response of the immersed tunnel element is favorable in the high frequency region,and the response amplitude is small;the influence of currents for the element is enormous;the mooring force is more serious when the direction reaches 60 degrees.This study provides a theoretical basis for the design of mooring system design and construction.