Tunnel leak prompts search for other weaknesses in Big Dig tunnels

09/17/2004 | Boston Globe (tiered subscription model), The

Engineers in Boston are scurrying to make sure tunnel walls built in the costly Big Dig project don't develop leaks like the one on Wednesday that sent water rushing into a tunnel, causing a 10-mile rush-hour traffic jam. The leak, which occurred in one of the deepest points of the main Interstate 93 tunnel, was blamed on sand or clay that fell into the concrete mix when the tunnel walls were being poured a decade ago. Engineers said they could fix the problem by injecting grout into the area.

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Boston Globe (tiered subscription model), The

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