California Governor Jerry Brown announced this summer that the state will move forward with plans for two multi-billion dollar water supply tunnels. Twin 56-km long (35 miles) tunnels will be constructed to convey water from the Sacramento River south to an existing aqueduct that serves the San Joaquin Valley and Southern California. [Source: World Tunnelling. Image: Rich Pedroncelli via KTVU.com]
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Lasers, Software and the Devil’s Slide
[Editor] National Science Foundation (NSF) Press Release – June 30, 2008. Screenshot Credits: Jeramy Decker, Kiewit Corp [/Editor]
Running for more than 1,000 kilometers along picturesque coastline, California’s Highway 1 is easy prey for many of the natural hazards plaguing the region, including landslides.
The California Department of Transportation (Caltrans) is currently building a kilometer-long tunnel to bypass one of the most landslide-prone stretches of the highway, the Devil’s Slide, to help ensure drivers’ safe passage.
Using a new software package developed by researchers at Virginia Tech in Blacksburg, Va., project engineers are getting a detailed 3-D view of the rock exposed in the excavation, adding a new tool for improving both safety and construction progress.
[Editor] Click through for the rest of the press release. [/Editor]
Going Underground at Dulles Airport in Washington, D.C.
Hanging Lake Tunnel (Colorado) repair nearly complete
A stretch of tunnel on Eastbound I-70 in scenic Glenwood Canyon Colorado was closed last March because of a 70-foot long crack in the ceiling. Since then the two-lane westbound bore has been handling both eastbound and westbound traffic while repairs to the damaged segment were undertaken. This project has a little of everything: heavy excavation, rockfall, slab reinforcing, geofoam, and even geogrid! Read on for more details, a map and photos. (Photo by Concrete Works Of Colorado)