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  TBM Hyperbaric Intervention beneath a Highway in New İstanbul Airport Metro Project

  Istanbul New Airport Metro Project is a 38 km long single track metro line, which has in total 76 km of railway length and consists of 69 km TBM tunnels. In order to deal with long TBM tunnel excavations, 10 EPB type TBMs with a diameter of 6,56 meters from 4 different TBM suppliers are used. This paper investigated one of the TBMs which bored through a frequently changing and complex geology and had to be maintained and repaired under hyperbaric conditions as it was lying 75 meters under a heavily used highway heading to the new airport. The aim of this study is to show how geological transition zones effect face stability and cause extraordinary methods like hyperbaric diving operation to continue excavation and how such operations are planned, applied and contributed on the advance stability of the TBM. In this manner essential TBM parameters like torque, thrust force, face pressure, advance rates are observed in relation with prevailing geological conditions and hyperbaric diving operation and respectively cutterhead maintenance works are explained in detail, finally indicating operation’s effects on TBM’s further advance.

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