Abstract:

On basis of presenting the stateoftheart of the researches on the major structural types, the structural design methods (particularly the design methods for the central walls), the construction methods (particularly the proper construction sequences of the doublearch tunnels with asymmetrical pressure and shallow cover), the monitoring and measurement, the geology forecasting and the waterproofing and drainage of doublearch tunnels that have been made in China, the author summarizes the problems regarding doublearch tunnels that are to be urgently solved in the future and make an outlook on the new possible types of doublearch tunnels.

Key words:  , mountainous areadoublearch tunnel designconstruction waterproofing and drainage central wall