KEY TECHNOLOGIES FOR CIVIL ENGINEERING CONSTRUCTION OF XIAMEN XIANG'AN SUBSEA TUNNEL

Xiamen Xiang'an Tunnel is the first subsea tunnel constructed by drill and blast method in mainland China. The main difficult of the construction is that, a three-lane tunnel with large section goes through several poor geology areas, such as the area of full or strong weathered stratum in which tunnels buried at shallow depth, water-rich sand stratum in shoal and submarine weathered groove, and collapse, water gushing, and sand gushing is likely to happen at these areas. This paper mainly introduces key technologies for dealing with these poor areas during the construction of the subsea tunnel, and their successes guarantee the safety and high-quality of the project.