TBM Breakthroughs in Pressurized Conditions—Three Rivers Protection and Overflow Reduction Tunnel (3RPORT) and Northeast Boundary Tunnel (NEBT) Projects - NAT2022
- Organization:
- Society for Mining, Metallurgy & Exploration
- Pages:
- 9
- File Size:
- 3920 KB
- Publication Date:
- Dec 1, 2022
Abstract
As part of the 3RPORT and NEBT Projects, 5-mile Combined Sewer Overflow Tunnels were excavated with a 19 ft diameter Slurry and 26 ft diameter EPB Tunnel Boring Machines. Due to the difficult geological and hydrogeological conditions, both tunnels were excavated maintaining a ground support pressure between 2 and 5.5 bar imposing significant challenges to the projects. The first part of the paper describes the general characteristics of both projects while the second part focuses on the challenges and technical details of the pressurized breakthroughs that took place in deep shafts excavated in urban environment as part of the projects.
Citation
APA: (2022) TBM Breakthroughs in Pressurized Conditions—Three Rivers Protection and Overflow Reduction Tunnel (3RPORT) and Northeast Boundary Tunnel (NEBT) Projects - NAT2022
MLA: TBM Breakthroughs in Pressurized Conditions—Three Rivers Protection and Overflow Reduction Tunnel (3RPORT) and Northeast Boundary Tunnel (NEBT) Projects - NAT2022. Society for Mining, Metallurgy & Exploration, 2022.