London’t mega-project known as Crossrail that involves the construction of 118 km (73 mi) of new rail line with 42 km (26 mi) of new tunnels. The geotechnical investigation for Crossrail included rock coring, and some 561 pallets of core are going to be stored inside the mined out portion of a salt mine in Cheshire. The temperature and humidity levels remain consistent year-round making it an ideal place to store the core. According to the NCE article, this material is less than half of the core drilled during the investigation phase of the project. [Source: New Civil Engineer. Image: New Civil Engineer]
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Thanks to approximately $100 million from President Bush’s proposed 2009 budget, the $1.8 billion project creating a light-rail line from downtown Seattle to the University of Washington is likely to break ground some time this year. The project will involve twin bored tunnels on the order of 3 miles in length. It is scheduled to open for use in 2016.
There is another notable tunnel project associated with the Seattle Light Rail, known as the Beacon Hill tunnel which I have blogged about before.