厦门翔安海底隧道钢筋腐蚀监测技术

STRUCTURAL MONITORING TECHNIQUES FOR XIAMEN XIANG'AN SUBSEA TUNNEL

海底隧道由于其特殊及地质环境的复杂性,为保证海底隧道钢筋混凝土的耐久性与结构服役能力,对其腐蚀状态进行监测尤为迫切。该文研究了翔安隧道钢筋腐蚀监测系统的设计,包括商用的以及基于电化学和物理方法的自主研发的腐蚀传感器,腐蚀监测断面与测点的布置、腐蚀传感器的安装,以及腐蚀数据库的建立。通过现场采集的腐蚀监测数据,评价了翔安海底隧道目前的腐蚀状况。最后介绍了基于超声导波的钢筋腐蚀监测研究新进展。

Due to the particular and complex engineering environment of subsea tunnels, it is especially imperative to monitor the condition of steel corrosion in reinforced concrete（RC） of subsea tunnels for structural serviceability and durability of RC structures. In this paper, the largest excavation section subsea tunnel-Xiamen Xiang＇an subsea tunnel is studied. Especially, the design of corrosion monitoring system is focused due to its complexity. Both the commercial corrosion sensors and the developed corrosion sensors based on electrochemical and fiber Bragg grating（FBG） techniques are adopted. The arrangement of the corrosion monitoring sections, their location, the installation of the sensors and the establishment of corrosion database are discussed. Then, the evaluation of corrosion in subsea tunnel is established based on the monitoring data of reinforced concrete collected in field. Based on the monitoring data collected in the field of the subsea tunnel, the status of stress and corrosion in Xiamen Xiang＇an subsea tunnel can be evaluated. Finally, the promising technique based on ultrasonic guided waves for monitoring steel corrosion in RC is also discussed.