Abstract:

 HefeiWuhan passengerdedicated railway goes through the nonmetamorphic zones of Dabieshan mountainous area. During the construction of the tunnels on the railway, fire accidents occur. Insitu measurements and chemical tests are made to determine the compositions of the rocks and gases and the geotectonic theory is used to probe into the gas gushing mechanisms, on basis of which technical construction countermeasures are recommended. Therefore, the construction of the tunnels are under safe and reliable control during the complete construction course. The technology has been preliminarily used in the construction of the tunnels on HefeiWuhan passengerdedicated railway and good effects have been achieved.

Key words: passengerdedicated railway  , tunnel gas  , gas gushing mechanisms  , construction countermeasure