COMPLETING ROME'S METRO

The article describes the problems encountered in the construction of the final stages of the 10.2 km line of the Rome metro. The line includes a section constructed by Metroroma running from central Rome to Ottaviano. The 4.4 km of twin bore line, with a finished internal diameter of 5.5 M, includes six stations and two roadway underpasses to take the Tiber embankment roads beneath the line where it surfaces. In this section 3.1 km of twin tunnels were bored at depths from 16-60 M. The bores converge, surface, cross the river and then go underground again for 1.3 km. The shield-driven bores cross volcanic and travertine soils then travel through silty clay deposits. Two water tables permeate the volcanic deposits and also the gravel and sand. The lining system used for the bored tunnels involved the use of 280 mm thick precast concrete segments joined by longitudinal and circumferential pre-stressed diwydag bars. This method, a world first, was adapted as it was considered that bolted segments would not prove as durable in the ground conditions encountered. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/10480594
• Corporate Authors:

  Morgan-Grampian (Professional Press) Limited

  Morgan-Grampian House, Calderwood Street
  London SE18 6QH,   England 
• Publication Date: 1979-12

Media Info

• Features: Figures; Photos;
• Pagination: p. 12-17
• 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: Construction; Construction management; Excavation and tunneling; Foreign; Geological events; Precast concrete; Segmental construction; Shielding (Tunneling); Structural design; Subways; Tunnel lining; Tunneling; Tunnels; Volcanic deposits
• Uncontrolled Terms: Tunnel design
• Geographic Terms: Italy; Rome (Italy)
• Old TRIS Terms: Geological conditions; Subway construction
• ITRD Terms: 3666: Construction method; 8051: Italy; 4792: Precast concrete; 3394: Shield driving; 3374: Tunnel; 3385: Tunnel lining; 1191: Underground railway
• Subject Areas: Bridges and other structures; Construction; Geotechnology; Highways; Public Transportation; I54: Construction of Tunnels;

Filing Info

• Accession Number: 00311438
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Jun 26 1981 12:00AM