THE STACKED-DRIFT TUNNEL
The 1,500 ft Mount Baker Ridge tunnel and adjoining lidded structures are described which provide a 3,400 ft long stretch of concealed traffic for the Seattle portion of I-90. It is the world's largest tunnel driven through soft soil, and its lighting and control systems are state of the art. The lids over the approaches support parks that unite neighborhoods separated by an existing highway which is being incorporated into the I-90. Soil investigations showed that the new tunnel should be built with minimum face exposure to lessen the chance of slides or subsidence. Instead of a single bore, the design required 24 concrete-filled drifts forming a compression-ring liner around a 63.5 ft core of soil that would be excavated only after the ring was in place. Details of the design and construction are described. The development of an automated distrubuted-control system enables the operation of the tunnel and the lids by one person at one computer console. This project has been named the Outstanding Civil Engineering Achievement of 1990.
-
Availability:
- Find a library where document is available. Order URL: http://worldcat.org/oclc/10480594
-
Authors:
- Robison, R
- Publication Date: 1990-7
Media Info
- Features: Figures;
- Pagination: p. 40-42
-
Serial:
- Civil Engineering
- Volume: 60
- Issue Number: 7
- Publisher: American Society of Civil Engineers
- ISSN: 0885-7024
- Serial URL: http://www.pubs.asce.org/ceonline/newce/html
Subject/Index Terms
- TRT Terms: Approach lanes; Automation; Control systems; Lighting systems; Operations; Soft soils; Structural design; Tunneling; Tunnels
- Uncontrolled Terms: Tunnel design
- Old TRIS Terms: Approaches; Tunnel lighting
- Subject Areas: Administration and Management; Bridges and other structures; Design; Highways; I25: Design of Tunnels;
Filing Info
- Accession Number: 00497537
- Record Type: Publication
- Files: TRIS, ATRI
- Created Date: Sep 30 1990 12:00AM