UNDER THE VOLCANO

This article reports progress on the naples underground public transport system currently under construction between garibaldi and secondigliano. The 16.5 km line, part tunnel, part elevated track, rises 235 m from start to finish and the design by metropolitana milanese, includes a large spiral track section where gradients are up to 5.5%. The hill through which the tunnels are to be driven consists of welded ash or tuff, overlying coarse sand-size, poorly cemented granular pumice deposits. The project is funded by the city of naples, the Italian government and the European community. Metrosud is one of 3 joint ventures working on the project; two of their projects are detailed: a) an experimental section was begun in 1986 and is now complete. This consisted of a free standing, 5 m dry tunnel excavated in hard tuff, with steel ring lining and reinforced spray concreting; b) metrosud have a second stage nearing completion and are preparing the third stage which includes 1800 m through loose pyroclastic deposits; this is expected to take 5 years. The final section, near the coast, may not be financed until 1995 or later: surface groundwater and loose pyroclastic deposits will dictate the use of a slurry tunneller on an earth pressure balance machine. Cooperative ventures are likely.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00174653
• Corporate Authors:

  Thomas Telford Limited

  London,   United Kingdom 
• Authors:
  • -
• Publication Date: 1989-9

Language

• English

Media Info

• Pagination: p. 34-5
• Serial:
  • GROUND ENGINEERING
  • Volume: 22
  • Issue Number: 6
  • Publisher: EMAP CONSTRUCT LIMITED
  • ISSN: 0017-4653

Subject/Index Terms

• TRT Terms: Ash content; Highway grades; Pozzolan; Public transit; Railroad transportation; Slopes; Soils; Subways; Tunnels; Volcanic rock; Volcanoes
• Geographic Terms: Italy
• ITRD Terms: 4580: Fly ash; 2806: Gradient; 8051: Italy; 4185: Pozzolan; 744: Public transport; 1173: Rail bound transport; 4156: Soil; 3374: Tunnel; 1191: Underground railway; 4002: Volcanic
• Subject Areas: Bridges and other structures; Geotechnology; Public Transportation; Railroads;

Filing Info

• Accession Number: 00497881
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Sep 30 1990 12:00AM