Abstract:

Karsts, which could lead to geological hazards in tunnel construction, need to be special treated. In the paper, however, karsts are analyzed and treated under the principle of making full use of the karsts. Karsts are encountered during the construction of Beifengya tunnel on Yalai highway. The karst caves are used for ventilation and drainage purpose after they are efficiently treated. In this way, instead of the adverse influence of the karst caves on the tunnel construction, significant economical and social benefits are achieved.

Key words: tunnel , karst cave, ventilation, drainage, benefit, Utilize