How a tunneling machine works. SR99 Tunnel Project. The SR 99 tunneling machine (Bertha) was designed specifically for the ground conditions beneath Seattle. The short video above shows how the machine dug the tunnel. The slurry pressure system is designed to work with the variety of different soil types found in Seattle. Safety initiatives include injecting excavated soil with chemicals and using slurry pressure to prevent ground collapse. The new design allows cutter disks to be inspected and
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How a tunneling machine works. SR99 Tunnel Project. The SR 99 tu…
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