Tunnel is being driven mainly on the bottom-heading system, but with the widening operated in two different ways. A side-heading system will be employed when nature of rock makes this advisable.


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    Title :

    Driving a five-mile rock tunnel for Japan railway


    Additional title:

    Eng. News-Rec


    Published in:

    Publication date :

    1922


    Size :

    4 pages


    Remarks:

    7 Figs.


    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English


    Keywords :


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