港珠澳大桥沉管隧道路面问题的探讨与改良构想

Discussions on pavement problem of Hongkong-Zhuhai-Macao Bridge immersed tunnel and its improvement

由于隧道路面不处于日照与雨水的开敞环境中,所以从耐久性角度考虑,通常认为隧道的路面环境相比开敞环境较为有利。该情况可能不适用于港珠澳大桥沉管隧道的路面。基于港珠澳大桥岛隧工程施工期在隧道内的长期观测,发现每年有5个月隧道内持续的潮湿,并且管节接头存在往复张合运动。经原因分析,判断这些问题在隧道运营期仍有可能存在。并且,对近期修建的国内外(水下)隧道路面进行了调研,发现路面早期损坏现象较常见。港珠澳大桥沉管隧道位于55 km的跨海通道中部,无替代路线,为避免隧道投入使用后路面在很短时间就损坏,导致修补,甚至封闭隧道,引起整条跨海通道不通顺或运营中止,针对隧道路面面层提出改良建议。

The pavement in the tunnel does not expose to the sunlight and rain, thus, from the perspective of durability, it isgenerally considered that the pavement environment of the tunnel is more favorable than the open environment. This may notapply to the pavement of Hongkong -Zhuhai -Macao Bridge immersed tunnel. Based on the long term observation in theconstruction of the Hongkong-Zhuhai-Macao Bridge island and tunnel project, we found that there is continues moisture in thetunnel within 5 months each year,and there exists a reciprocating opening-closing movement in the pipe joint. By analyzing thereason, it was judged that the problem still exists in the service period. And, some recently constructed tunnels wereinvestigated, early damages of road surface were commonly seen. The Hongkong-Zhuhai-Macao Bridge immersed tunnel islocated in the middle of the 55 km cross-sea channel, there is no alternative route. In order to avoid quick damage of roadsurface after the tunnel is put into use, which causes repairs, and even closing of the tunnel, leading to the slow traffic or closeof the entire link, we proposed improvement suggestions to the pavement.