SOFT-GROUND TUNNELING TECHNOLOGY ON THE BART PROJECT

DURING THE PAST FOUR YEARS, SAN FRANCISCO'S BAY RAPID TRANSIT SYSTEM HAS BEEN A PROVING GOUND FOR NEW TUNNELING METHODS, BOTH MACHINE AND HAND MINING. THE WORK WAS ALMOST ALL SOFT-GROUND TUNNELING, WITH SOILS RANGING FROM COARSE GRAVEL AND SAND TO CLAY AND SILT. THE RECORDS ON THREE DIFFERENT TUNNELING MACHINES AND SEVERAL SHIELDS USED HAVE BEEN ANALYZED TO DETERMINE THE COMPARATIVE EFFICIENCY OF MACHINE TUNNELING AND HAND TUNNELING UNDER THE PRESENT "STATE OF THE ART". SEVERAL DIFFERENT MUCKING METHODS WERE EMPLOYED TO MOVE EXCAVATED MATERIAL OUT OF THE SHIELD AND TUNNEL. TUNNEL LINING WAS A STANDARD ITEM REGARDLESS OF METHOD OF EXCAVATION--30-IN.-WIDE WELDED STEEL RINGS FABRICATED IN SEGMENTS. THE RECORDS INDICATED THAT TUNNELING MACHINES ACCOMPLISHED MORE IN A GIVEN DAY THAN HAND MINING, BUT MORE MAN-HOURS WERE LOST IN DOWNTIME IN MACHINE MINING. MANPOWER REQUIREMENTS WERE ABOUT EQUAL, AND MACHINE-MINED TUNNELS PRODUCED LESS SURFACE SETTLEMENT. /AUTHOR/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/10480594
• Supplemental Notes:
  • Vol 41, No 10, PP 72-76, 2 FIG, 3 TAB, 3 PHOT
• Authors:
  • Peterson, E
  • Frobenius, P
• Publication Date: 1971-10

Media Info

• Serial:
  • Civil Engineering
  • Publisher: American Society of Civil Engineers
  • ISSN: 0885-7024
  • Serial URL: http://www.pubs.asce.org/ceonline/newce/html

Subject/Index Terms

• TRT Terms: Downtime; Excavation and tunneling; Mucking; Personnel; Shields (Tunnels); Soft rock; Tunnel lining; Tunneling machines
• Old TRIS Terms: Shields (Tunneling)
• Subject Areas: Bridges and other structures; Construction; Highways; Society;

Filing Info

• Accession Number: 00215504
• Record Type: Publication
• Files: TRIS
• Created Date: May 9 1972 12:00AM