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Video: Ground Freezing and the Hetch Hetchy Water Supply Tunnel

November 6, 2012 rockman Comments Off on Video: Ground Freezing and the Hetch Hetchy Water Supply Tunnel

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, […]

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Crews assembling TBM for first ever tunnel under San Francisco Bay

June 29, 2011 rockman Comments Off on Crews assembling TBM for first ever tunnel under San Francisco Bay

What about the BART you may be wondering. Well, the Bart is not really a tunnel but a precast tube that was sunk and rests on the bottom of the bay. This water supply tunnel […]

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