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Video: Ground Freezing and the Hetch Hetchy Water Supply Tunnel

November 6, 2012 rockman Comments Off

This is a great video showing the application of ground freezing to deep excavations in unstable soil and high groundwater table. It’s also a nice overview of the reason the Hetch Hetchy project was undertaken, […]

Working Safely in Trenches and Test Pits

February 2, 2009 rockman Comments Off

The Associated Construction Publications organization have published an article on Working Safely Underground. It’s a good refresher for those of us who occasionally find ourselves working in trenches and test pits. Make sure you do […]