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Abstract: 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...