Abstract:

With Xiang'an subsea tunnel in Xiamen as an example, systematic study is made on the advance geological prediction technology, vibrationreducing blasting technology, soft and waterrich surrounding rock treatment technology and mud/ water gushing prevention and control technology during the construction of high risk subsea tunnels. The study results have been applied in the construction of Xiang'an tunnel. A series of safe tunnelling methods suitable for the construction of difficult and high risk large crosssection tunnels under complex geological conditions are summarized, which can provide technical support for the safe construction of similar tunnels in the future.

Key words: subsea tunnel, large crosssection, high risk, "drill and blast", method