基于模拟试验的超大型沉管浮运航道宽度研究

Research on width of large immersed tube floating channel based on simulation test

深中通道沉管隧道地处珠江口开敞海域,沉管采用钢壳混凝土结构,排水量大,浮运施工使用自航式浮运安装一体船,浮运航道总长约50 km,穿越榕树头航道、伶仃航道、矾石水道,同时需要开挖一段专用浮运航道。现行规范里,对所需航道宽度的相关规定尚不明确,因此需要对开挖航道的宽度进行研究。采用模拟试验的方式,通过不同风、流工况组合条件下的模拟试验,分析船舶航迹带宽度,为新建浮运航道宽度设计提供科学依据,同时提出了沉管浮运施工安全保障措施,对保障超大型沉管浮运作业安全起到一定的作用。

The immersed tube tunnel of the Shenzhen-Zhongshan Channel is located in the open sea area of the Pearl River Estuary.The immersed tube adopts the steel shell concrete structure with large drainage volume.The floating construction uses the floating transportation installation integrated vessel.The total length of the floating transportation channel is about 50 km,crossing the Rongshutou channel,Lingding channel,and Fanshi channel.At the same time,a special floating transportation channel needs to be excavated.In the current specifications,the relevant specifications for the required channel width are not clear.Therefore,it is necessary to study the width of the excavated channel.This study adopts the method of simulation test.Based on the simulation test under different wind and flow conditions,the width of the ship's track belt was analyzed,which provides a scientific basis for the width design of new floating channel.At the same time,the safety guarantee measures for the floating construction of immersed tube were put forward,which plays a certain role in ensuring the safety of floating operation of super large immersed tube.