ABSTRACT
Limited amount of investigation borings could be carried out due to the closely spaced buildings over the deep tunnel alignment. However, the geological conditions faced during the excavation are in a reasonable
According to the bore-hole findings and the tunnel excavation records, the ground water level around the Kabatas¸ Station is the same level with sea water level, then in the Taksim direction rises upwards with the topography and it stays in the cross section to be excavated before the Taksim station tunnel and in the station tunnel it approaches the invert of the tunnel (60.0). Generally the water inflow encountered during the excavation had no negative influence on the excavation progress of the works because of low permeability.
