Abstract
During the planning stage of a tunnel, the permissible future water leakage into the tunnel is determined with regard to the hydro-geological conditions and existing structures. Detailed specifications are drawn up concerning tests and observations to be made during excavation, and the interpretation of their results, as a guide to the execution of the grouting works. A brief account is given of a specific contract on which methods and equipment for drilling and grouting are adapted to the exacting demands made on accuracy and efficiency. Monitoring of water leakage and groundwater levels is to be continued after the completion of the tunnel.
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