Grouting work done earlier in the week was a possible cause of a bulge in the lining of a train tunnel under the River Thames. Two trains hit the bulge before the line was closed, but neither train derailed. [Source: New Civil Engineer]
Geologic Hazards
Video: Helicopter Based Rock Scaling “Sledgehammer”
[Updated May 26, 2011] A new, cleaner, longer version of the video has surfaced on YouTube recently. You can see it embedded below. It includes some footage of attempts to "water bomb" the rock loose […]
Miscellaneous
Chancellor Merkel, Premier Wen Tour Herrenchnecht Facility in Guangzhou
The German Chancellor and Chinese Premier toured a Herrenchnecht facility in China’s Guangzhou Province where Tunnel Boring Machines are manufactured for many of China and Asia’s high-profile tunnel projects. Herrenknecht maintains nine locations in China […]
Project Related
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)