海底隧道混凝土结构耐久性监测(英文)

Durability Monitoring of Concrete Structure of Subsea Tunnel

胶州湾海底隧道是我国自行设计建造的第二条海底隧道,其设计服役寿命为100年。选择阳极梯监测地下水和盐雾中氯离子在混凝土中渗透过程,选择环形电极监测混凝土中水分迁移。通过传感器数据分析,获得海底隧道混凝土结构的耐久性能。阳极梯预埋在隧道海域段Ⅵ级岩石破碎带的喷射混凝土和衬砌混凝土中,以及隧道出入口。环形电极采用后装法安装在海域段最深处Ⅵ级围岩区和隧道出入口的衬砌混凝土中。通过安装初期和运行1年后的耐久性监测数据分析表明,传感器工作良好,且隧道混凝土结构耐久性能良好。

Subsea tunnel at Jiaozhou bay is the second self-built tunnel in China with the designed service life for over 100 years. The anode-ladder-system is selected and used to monitor the chloride ion penetration into reinforced concrete structures in a corrosion groundwater and saline-fog environment. The expansion-ring-system is used to monitor the water transportation in lining concrete. And the durability of concrete structure of subsea tunnel is assessment according to the monitoring data. The anode-ladder-system monitor sensors are embedded into shotcrete and lining concrete in the Level Ⅵ broken surrounding rock zones of sea section and in the entrance of subsea tunnel. The expansion-ring-system are installed into lining concrete in the deepest section with Level Ⅵ broken surrounding rock zone and the entrance of subsea tunnel. The measurements from sensors installed in concrete structure for 1 year are promissory and follow the expected trends. According to the monitor results, the durability of concrete structure is good.