Gulf many rivers in our country, channel, 18000 km long coastline, there are nearly 20 cities linjiang, linhai. To build a tunnel across the river in the sea on a city block, can effectively solve the jianghai promote national overall traffic road network construction and the balanced development of the city.

China railway tunnel group co., LTD., China railway group belong to 10 years time to carry out the tunnel across the river in the sea theory and technology research, has made a series of innovations. One is to build the design theory and method of tunnel across the river in the sea, created based on the engineering control method of determining the minimum depth of underwater tunnel, reveals the underwater tunnel water pressure distribution law. The second is built across the river in the section of tunnel construction technology system to prevent sudden water head, typical sudden out ? underwater tunnel are put forward