Case Study on Construction Ventilation Mode of No.3 Inclined Shaft Working Lot of Baojiashan Tunnel

The mode of excavation by drill and blast method,rail-bound transportation system in the inclined shaft,trackless transportation system in the main tunnel and working at multiple faces is adopted in No.3 inclined shaft working lot of Baojiashan super-long highway tunnel.The construction ventilation scheme for the working lot is determined by analyzing the actual conditions of the working lot.The scheme is executed in the construction and good ventilation effect has been achieved,which demonstrates that the ventilation scheme adopted is reasonable and feasible.