Length of ventilation compartment of utility tunnels

 According to the ventilation characteristics required by the entrance pipelines, divides the utility tunnel into different types of cabins. Divides the ventilation mode into different conditions based on the ventilation countermeasures required in the operation of tunnels. Through calculating the ventilation system of utility tunnels with different length of ventilation compartments and performing the analyses from the perspectives of ventilation effect, fire safety, landscape effect and investment cost, considers that the length of ventilation compartment can exceed the 200 m restriction of the traditional utility tunnel design, which can reduce the number of air pavilions and enhance the overall coordination of road landscape.