Selection, design, and procurement of North America’s largest mixshield TBM for Portland, Oregon’s East side CSO tunnel
- C. Metzger, G. Colzani, G. Irwin
- Papid Excavation and Tunneling Conference…
Received: November 30, 2016 Revised: February 13, 2017 Accepted: February 13, 2017 Abstract: Background: Many subway/metro tunnels were constructed using close face shield machines in coarse grain soils in last decades. Configurations of the shield cutterhead and cutting tools are critical in terms of cost and project duration. There are currently no recognized methodologies available for the configurations due to the various geological and technical influencing factors. Several aspects have been considered in many single case studies.