Abstract:

It is the first time in China that natural ventilation modes with ventilation openings on the ground surface are used in the southern section of Chengdu Metro. Compared with the traditional ventilation modes of running tunnels，the natural ventilation modes have advantages in cost saving in respect of civil works, equipment and operation. The article gives a detailed introduction to the concept of the natural ventilation mode, the types of the ventilation shafts, the dimensions and spacing of the surface openings and selection of the types of the structures of the running tunnels.

Key words:  , running section of Metro  , natural ventilation ventilation shaft