The success of this project demonstrates that this technology is especially applicable in urban environments where surface disruptions are becoming increasingly unpalatable to the public. Crucially, the smaller compressors required for these plants used Freon as the cooling agent rather than the traditional ammonia which poses a significant health hazard in enclosed environments.ĭuring excavation, all of the cross passages remained dry and stable, with no instances of groundwater seepage or soil raveling. Custom skid-mounted plants were mounted to the sides of the tunnel liner, allowing unimpeded access for tunneling operations during the freeze system operation. In a first-of-its-kind application in North America, Keller, therefore, designed the ground freezing system, including the freezing plant, to be wholly installed from within the TBM tunnels. However, the six cross passages were located too far from the tunnel entrance to consider setting up the mobile freeze plant there. Micropile slide stabilization system (MS3)ĭue to surface restrictions, horizontal ground freezing was an attractive option.Vibro stone columns (vibro replacement) Sound TransitThe entire Central Link line runs for 14.6 miles (23.5 kilometers) from downtown Seattle through Tukwila and SeaTac to Seattle-Tacoma International.
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