DEVELOPMENT OF DESIGN PROCEDURES FOR STABILIZED SOIL SUPPORT SYSTEMS FOR SOFT GROUND TUNNELING. VOLUME IV. CASE HISTORY STUDIES, WASHINGTON METROPOLITAN AREA TRANSIT AUTHORITY SYSTEM
The practice of injecting chemical grouts into permeable soils in order to stabilize them for tunnel construction is a common procedure in Great Britain, Europe, and Japan. It is only within the last five years that this technology has been used in the U.S., namely, in the work for the Washington Metropolitan Area Transit Authority (WMATA) subway construction. This report documents five WMATA case histories where chemical grouting was used; information is provided as to the soil conditions, method of treatment, reason for treatment, and tunnel performance. The document is the fourth in a series directed towards the subject of use of chemical injection technology to stabilize sand soils for ground movement control during tunneling. The research program has been carried out over the last three years at Stanford University. Other available project reports are: Volume I: A Report on the Practice of Chemical Stabilization Around Soft Ground Tunnels in England, France, and Germany (PB-272 771), and Volume II: Preliminary Results (PB-273 064). The chemical grouting was used as an economic alternative to conventional underpinning. Ground movement data show that the settlements in the grouted areas were generally small (less than 50mm) and that no cases of serious ground runs occurred. The best ground control was achieved where the soils in the upper half of the tunnel cross-section and above the crown were uniformly groutable, and good, general construction and support practices were used. Grouting of the soils around the tunnel was less effective at movement control in cases where soil layers in the crown area were ungroutable.
- See also Volume 2, PB-273064.
Stanford UniversityDepartment of Civil Engineering
Stanford, CA USA 94305
Urban Mass Transportation Administration400 7th Street, SW
Washington, DC USA 20590
- Clough, GGW
- Baker, W H
- Mensah-Dwumah, F
- Publication Date: 1978-10
- Pagination: 170 p.
- TRT Terms: Cement; Chemical grouts; Clay; Construction; Earth movements (Geophysics); Economic factors; Excavation and tunneling; Finite element method; Forecasting; Ground settlement; Grout; Grouting; Sodium silicate; Soft soils; Soil stabilization; Soils; Structural design; Studies; Subways; Tunneling; Tunnels
- Identifier Terms: Washington Metropolitan Area Transit Authority
- Uncontrolled Terms: Earth movements; Pressure grouting; Tunnel design
- Old TRIS Terms: Economic considerations; Subway construction
- Subject Areas: Bridges and other structures; Construction; Economics; Geotechnology; Highways; Public Transportation;
- Accession Number: 00197442
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: UMTA-MA-06-0025-78-9Final Rpt.
- Files: NTIS, TRIS, USDOT
- Created Date: Jul 31 1981 12:00AM