The Bertha tunnel boring machine has resumed chewing away beneath Seattle after a ‘suspension for cause’ order from WSDOT shut it down in January following two safety incidents. The BTM began tunneling with some conditions […]
The repaired cutterhead has been in the pit several weeks now, and the final three pieces of shielding for the Bertha TBM have been lowered into the access pit. Seattle Tunnel Partners team members will […]
GeoPrac sponsor Moretrench was very active at the recent Rapid Excavation and Tunneling Conference in New Orleans earlier this month. VP Paul Schmall helped teach a short course on grouting in underground construction, and Director […]
What will 2015 hold for the tunneling industry? Tunnel Business Magazine asked a panel of 4 industry experts that question. The panel consisted of a Colorado School of Mines Professor as well as reps from […]
The Seattle Tunnel Partners JV is attempting to remove the rest of an 8 inch diameter steel well casing that has been blocking the Bertha tunnel boring machine since December 8, 2013. The upper 55 […]
An article in TBM magazine provides a nice overview of cellular concrete technology. I never knew this (although it makes sense) but the material was used primarily as a lightweight floor leveling product for high-rise […]
Steel augers reportedly from a piling operation at the ground surface broke through a railway tunnel in East London. Fortunately the train drivers noticed and reported the damage before any serious accident occurred. The busy […]
Members of an Italian herritage association claim that tunneling 50 meters below the streets of Rome would put the Roman Colosseum at risk of collapsing. Here is an excerpt from the article I found: "The […]
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, […]
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 […]
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