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    Using this criterion, as ground conditions change, early indications and warnings could lead the contractor to revisit the machine operational parameters, tunneling operation and scheduling, and scheduled stoppages to cope with the ground conditions at and ahead of the tunnel face.

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  • Bertha (tunnel boring machine) - Wikipedia

    Bertha was designed and manufactured by Hitachi Zosen Sakai Works of Osaka, Japan, and is the world's largest earth pressure balance tunnel boring machine, at a cutterhead diameter of 57.5 feet (17.5 m) across.

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    AVN Machines belong to the category of closed, full face excavation machines with a hydraulic slurry circuit. The soil to be excavated is removed using a cutterhead adapted to the respective geology. This makes it possible to use the machines in almost all geological conditions.

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