Mary, the tunnel boring machine that has been paving the way for the expanded Hampton Roads Bridge-Tunnel, hit a milestone Wednesday when she finished the first of twin tunnels that are part of the ...

expansion achieved a major milestone as its tunnel boring machine reached its destination. Nicknamed "Chessie," the tunnel ...

Here's how the tunnel boring machine, or TBM, works: As the 200-ton TBM moves forward, a round cutter head studded with titanium teeth grinds into the tunnel face and splits large chunks off the rock.

Tunnel boring machines (TBMs) are very picky about the rocks they chew through. This is why geologists must monitor the rock at the head of every tunnel. On good days, TBMs can bore through rock ...

Dublin, March 07, 2024 (GLOBE NEWSWIRE) -- The "Shield Tunnel Boring Machine Market - Global Industry Size, Share, Trends, Opportunity, and Forecast, 2018-2028" report has been added to ...

The tunnel boring machine known as Chessie broke through the receiving pit on Two Island at the Thimble Shoal Channel at the Chesapeake Bay Bridge-Tunnel Monday, the ...

Big Bertha tells the story of the machine that changed all that — or, more accurately, was the reason for it. This engineering marvel made history by creating the longest and widest road tunnel in the ...

Mary, the tunnel-boring machine, is on the move again! Thursday, Mary began boring a twin eastbound tunnel in part with the Hampton Roads Bridge-Tunnel Expansion Project. Watch: First of 4 ...

Burrowing of a new tunnel to help carry more vehicles between Virginia Beach and the Eastern Shore has resumed about 10 months after a gigantic boring machine struck an old ship anchor buried ...

In short: A tunnel boring machine in the Snowy 2.0 hydropower project has become wedged in hard rock and unable to move forward. It's the latest in a series of problems plaguing the $12 billion ...

The tunnel boring machine is driving the roughly 10.5-mile headrace tunnel from the high level Tantangara Dam to an underground powerhouse. A second TBM will form the 3. 7-mile tailrace down to ...