Abstract:

Based on the function requirement, the backfill protection of immersed tunnels can be divided into three sections, i.e., normal section, navigation channel section and nearland section. Among these sections, the design of the nearland section is influenced by many factors, therefore it is the key part of the design of the backfill protection of immersed tunnels. In the paper, the backfill protection of the nearartificialisland section of the immersed tunnel of HongkongZhuhaiMacau Link is studied, comparison and contrast is made between flexible protection and rigid protection, and a flexible solution is proposed for the project. Furthermore, the design details of the flexible protection solution are provided. Calculations and tests show that this type of protection is rational and can be used for other similar projects.

Key words: immersed tunnel, nearland section, backfill protection, rigid protection, flexible protection, ship collision, stability