High Cover Tunneling with Novel Ground
Support in Mountainous Terrain
- Two TBMs achieved world records in their size class, excavating 235 m (771 ft)/week and 841.8 m (2,761 ft)/month
- TBM jobsite is located approximately 1,000 m (3,280 ft) above sea level in the mountains
- The TBMs were designed with mesh installation windows in the protective roof shield
- Automated materials handling for safe and effective tunneling