Study on ventilation and smoke exhaust scheme for cross-ocean tunnel of Qingdao Metro Line 8

Studies the ventilation and smoke exhaust scheme of the long cross-ocean tunnel from Dayang Station to Qingdao North Station of Qingdao Metro Line 8. By setting the rail top vent and the top air duct which connects the middle of the sea area to the accident air shaft of No.1 section air shaft in the land section, the problem that the section air shaft cannot be set in the middle of the sea area is effectively solved. Meanwhile, divides the cross-ocean tunnel into four longitudinal ventilation sections to ensure that there is only one train running in a ventilation section during normal operation. Based on SES simulation analysis, adopts a blocking mode to meet the needs of various complex blocking conditions. The simplified blocking mode reduces the control difficulty of the ISCS (integrated supervisory control system) and improves the efficiency of on-site debugging. Due to the 2.5 km long top air duct, the tunnel fans are connected in series to meet the requirements of high wind pressure, which provides a reference for the design of the ultralong cross-ocean tunnel.