UNIQUE SOLUTIONS AT RICHMOND

This article describes the construction of two adjoining combined sewage overflow tunnels in the City of Richmond, VA, USA. CSO 1 is a combination of open cut at the eastern diffuser area, with a tunnel from a common shaft with two portals. CSO 2 is an open cut, running parallel to railway tracks from the terminus of CSO 1 to Reedy Creek. CSO 1 is located near a boundary between crystalline rock, mostly granite, and sedimentary rock. A Robbins model 1101-198 tunnel boring machine (TBM) was used for the excavated section. An excavation shaft was built between March and July 1996, and the TBM was placed in the shaft and began work in mid-July. Drilling proceeded at variable rates, sometimes slowly when very hard rock was encountered. In mid-January 1997, it stopped when serious ingress of ground water occurred. Shortly after drilling resumed in early March, serious flooding occurred; within a short time, the whole tunnel and shaft were filled with water to a depth of 30ft. By the end of April, repair work was completed, and drilling resumed again, with a cofferdam in place and dewatered. Other difficulties included breakdowns to the TBM, due to water and rock, and the need to support an old stone wall that was encountered. In December 1997, the TBM was recovered intact, after it had finished its work.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09568700
• Corporate Authors:

  THE MINING JOURNAL LTD

  60 WORSHIP STREET
  LONDON,   United Kingdom  EC2A 2HD
• Authors:
  • Burke, J
• Publication Date: 1998-2

Language

• English

Media Info

• Pagination: p. 17-8,20-1
• Serial:
  • WORLD TUNNELLING AND SUBSURFACE EXCAVATION
  • Volume: 11
  • Issue Number: 1
  • Publisher: THE MINING JOURNAL LTD
  • ISSN: 0956-8700

Subject/Index Terms

• TRT Terms: Cofferdams; Construction; Cut and cover tunneling; Drilling; Excavation; Excavations; Floods; Granite; Groundwater; Rocks; Sewers; Tunnel borers; Tunnels; Urban areas
• Geographic Terms: United States
• ITRD Terms: 3442: Cofferdam; 3655: Construction; 3395: Cut and cover; 3871: Drilling; 5155: Excavation (process); 2569: Flooding; 3383: Full face tunnelling machine; 4101: Granite; 4383: Ground water; 4154: Rock; 2927: Sewer; 3374: Tunnel; 313: Urban area; 8122: USA
• Subject Areas: Bridges and other structures; Construction; Geotechnology; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00749829
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD
• Created Date: Jun 26 1998 12:00AM