The century-old PATH subway tunnels underneath the Hudson River were not excavated through bedrock, but rather under a thick layer of silt and clay. Apparently there is a a sufficient security concern to warrant protecting the tops of the tunnels with some form of blanket to protect against bomb blasts. [Source: NYPOST.com via ASCE SmartBrief. Image: NYPOST.com]
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Devil’s Slide Breakthrough Video and Links
The “breakthrough” media event for CALTRANS’ Devil’s Slide Tunnel project was this past Friday. A large crowd of politicians, news crews and locals were on hand as a road-header broke through a shotcrete face in a ceremony to mark the completion of the excavation portion of the first of two tunnels. It will still be over a year until the tunnels are opened to traffic. The second tunnel is expected to breakthrough as early as this week. (Photo by SFGate.com)
Caltrans tunnel punch-through from Barry Parr on Vimeo.
The Video came from the Coastsider, the page also has comments from the videographer, Barry Parr, which offer a good perspective on the event.
Click on through for more links etc.