Efforts to stabilize a collapsed section of a new $130-million metro tunnel in Barcelona are nearly complete. Related work on the systems Line 5 is on hold while engineers seek ways to improve the New Austrian Tunneling method being used 30 meters deep.
Some 15,000 cu m of concrete have been poured into the newly excavated 160-m-long service tunnel, which collapsed in the Carmel area of north Barcelona late January. Soil in the collapse zone is being grouted, says a spokesman for Generalitat de Catalunya, the regional government of Catalonia.