Subsea tunnel ventilation design for Qingdao Underground Railway Line 1

According to the actual situation of the project, analyses the characteristics of the subsea tunnel, and studies the feasibility of the longitudinal ventilation design scheme combined with the data of underground rarlway line, traffic and tunnel structure. Taking the critical velocity as the evaluation index, calculates the critical velocity and carries out the initial selection of the tunnel fan. Simulates the air velocity of the fire by SES simulation software, and the result shows that the wind speed reaches the critical velocity.