悬浮隧道整体结构行为机理试验研究1:总体

Submerged floating tunnel overall structural behavior mechanism experimental study 1:General

2018年港珠澳大桥沉管隧道完工,中交港珠澳大桥岛隧工程组建了悬浮隧道联合研究组,提出并设计了锚索式悬浮隧道整体水池试验。原型长1.2 km,比尺1:50。对试验意义、技术可行性及细节进行多轮研讨,第一阶段试验于2019年初启动。在天津修建专用试验水池,在大连制造试验模型。文章介绍试验总体设计及演变、关键问题、实践反馈以及第二代试验设计。主要论点或发现为:1)悬浮隧道整体水池试验宜分为机理、参数和工程三阶段,其中的机理试验宜分为预试验、机理试验和验证试验3个阶段;2)需要系统支撑确保试验效率与质量;3)提出并比选了净浮力模拟的3种方法;4)试验中需注意避免人造波浪对模型及测量系统的损害。

The immersed tunnel works of Hongkong-Zhuhai-Macao Bridge was completed in 2018,a joint research team on submerged floating tunnel(SFT)was established for CCCC Hongkong-Zhuhai-Macao Bridge island&tunnel project to propose and design a overall basin test of tethered type SFT.The prototype length of 1.2 km long,with a scale of 1:50.After rounds of discussions on test significance,technical feasibility and details,the 1st generation basin test was initiated in early 2019.A special SFT basin was built in Tianjin and a test model was fabricated in a Dalian laboratory.In this paper,we introduced the general test design scheme and its evolution,critical issues encountered,and improvements for 2nd generation test.Main discussions or findings at works were:1)the overall SFT basin test should be divided by three stages for mechanism,parameters and engineering respectively,in which the basin test is preferably divided by 3 stages targeted at trial,structural behavior,and validation;2)a supporting system was required to ensure efficiency and quality;3)model residual buoyancy simulation alternatives were proposed and compared;4)attention shall be paid to the risk of SFT model damaging from artificially imposed regular waves.