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Anonymous ID: 99e8a8 June 11, 2020, 4:58 a.m. No.9572379   🗄️.is 🔗kun   >>2388 >>2428 >>2437 >>2567

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Tunnels: Seattle’s boring past filled with thrills

Originally published December 10, 2011 at 10:00 pm

 

Up top, few people know about, much less appreciate, the work going on down here. To hear our local pols discuss construction of the Alaskan Way Viaduct Replacement Tunnel, you’d think we’d never done this before. Somehow, what was lost in much of the public discussion getting to “yes” on that project was this: Tunnels R Us, Seattle. And they have been, for more than 100 years.

 

Now, and for about the next five years, Seattle will be in the middle of an unprecedented tunneling boom, from the behemoth viaduct-replacement project to three tunnels being dug to carry Sound Transit users to Capitol Hill and the University District. More than 250 workers are already on the job -

150 mining two tunnels from the University of Washington to Capitol Hill, 107 more working to bore a tunnel from Capitol Hill to downtown.

And many more are coming.

 

Robinson has mapped our history of tunneling, and counts more than 100 tunnels under the city, more than 40 miles’ worth in all, built since 1890.

https://www.seattletimes.com/pacific-nw-magazine/tunnels-seattles-boring-past-filled-with-thrills/

Anonymous ID: 99e8a8 June 11, 2020, 5:06 a.m. No.9572437   🗄️.is 🔗kun   >>2444 >>2451

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History of tunneling in Seattle focus of Monday night talk at Edmonds Senior Center

 

The program will be presented by Robert “Red” Robinson, who is Senior Vice President and Director of Underground Services with Shannon & Wilson, a prominent geotechnical and environmental firm that is actively engaged in projects around the world and has its headquarters in Seattle.

 

Robinson will describe how the Seattle area has experienced 130 years of increasingly challenging tunneling, constructing more than 150 tunnels, and totaling over 80 miles, beneath hilly topography and through complexly inter-bedded glacial and inter-glacial soils.

To deal with these geologic conditions, local tunneling has evolved through at least four phases, beginning with hand-mining and timber support, leading to today’s huge closed-face tunnel boring machines and pre-cast tunnel segments.

 

Most of the Seattle tunnels constructed over the years are still in use today.

https://myedmondsnews.com/2014/03/history-tunneling-seattle-focus-monday-night-talk-edmonds-senior-center/