WASHINGTON METRO'S TOPLESS TUNNELS
Soil investigations for a section of the Metro where existing major highway and bridge structures would leave relatively little cover over the tunnels revealed that the tunnels would have to be driven through mixed face, with a clay invert and a waterlogged sand crown. Thus, there was a good chance that the roof would fall in. The design settled on a scheme of grout injection to stabilize the granular soils and preclude the development of runs in the crown of the tunnel headings. Combined with careful tunneling, it was felt that this would be sufficient to maintain both safety and decorum. The paper discusses the construction planning, design provisions, grouting program, equipment and methods, problems and costs.
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Supplemental Notes:
- Presented at the 3rd Rapid Excavation & Tunneling Conference, Las Vegas, Nevada, 14-17 June 1976.
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Corporate Authors:
American Institute of Mining, Mettalurgy & Petroleum Engineers
345 East 47th Street
New York, NY United States 10017 -
Authors:
- Kuesel, T R
- Conference:
- Publication Date: 1976
Media Info
- Pagination: p. 296-310
Subject/Index Terms
- TRT Terms: Construction; Costs; Granular soils; Grouting; Soft soils; Soil mechanics; Soil stabilization; Soils; Subways; Tunneling; Tunneling machines
- Identifier Terms: Washington Metropolitan Area Transit Authority
- Uncontrolled Terms: Construction costs; Stabilization
- Old TRIS Terms: Soft ground tunnels; Subway construction; Tunnels and tunneling
- Subject Areas: Bridges and other structures; Construction; Finance; Geotechnology; Highways; Public Transportation;
Filing Info
- Accession Number: 00152808
- Record Type: Publication
- Source Agency: Engineering Index
- Report/Paper Numbers: Conf Paper
- Files: TRIS
- Created Date: May 31 1981 12:00AM