Design Method and Test of Twin-tunnel Complementary Ventilation for Highway Tunnel

In view of the problem that the ventilation load of left tunnel and right tunnel presents a big difference in single slope tunnel,the twin-tunnel complementary ventilation mode is put forward. The calculation method for twin-tunnel complementary ventilation mode in detail when the inter-exchange air volume and length of the left tunnel and right tunnel are different are derived. The feasibility and reliability of twin-tunnel complementary ventilation are verified through physical model experiment. The twin-tunnel complementary ventilation design method is utilized to perform the brief ventilation design of a tunnel. The fans configuration scale of single inclined shaft blowing and exhausting longitudinal ventilation and complementary ventilation are compared,and the economical benefit of complementary ventilation scheme is analyzed. The result indicates that( 1) the downhill tunnel is used as the shaft for the uphill tunnel in complementary ventilation,the fresh air from the downhill tunnel flowed into the uphill tunnel and made the air pollutant concentrations reduced inside the uphill tunnel;( 2) this tunnel ventilation technology can reduce the ventilation system scale and balance the air volume inside the left tunnel and right tunnel,meanwhile,the initial cost and energy consumption for ventilation can be reduced. The complementary ventilation possesses good economical and ecological benefits.