SINKHOLES IN SINGAPORE

In a meeting of the British Tunneling Society in London, a technical advisor to the Land Transport Authority in Singapore presented a discussion titled "Settlements and Sinkholes in Singapore." Results from an analysis of sinkholes in Singapore were presented. The analysis showed that sinkholes occurred 1) at or around launching chambers or repetition shafts 2) when mixed faces or geological boundaries surrounded the tunnel face, or 3) where face pressure was well below natural water pressure. Inadequate face pressure and over- excavation were to blame for problems encountered in weathered rocks. To minimize risk of sinkholes in conditions similar to those of Singapore, the presenter suggested measures such has specifying the minimum length of ground treatment at break-in and break-out; improved method statements and risk assessments; ground interpretation; machine configuration and face stability. Other suggestions included additives, grouting, head access, maintenance, risk assessment and contingency planning.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0041414X
• Corporate Authors:

  Polygon Media Limited

  Tubs Hill House, London Road
  Sevenoaks, Kent TN13 1BY,   United Kingdom 
• Authors:
  • Shirlaw, N
• Publication Date: 2004-2

Language

• English

Media Info

• Features: Figures; Photos; Tables;
• Pagination: p. 40-42
• Serial:
  • Tunnels & Tunnelling International
  • Volume: 36
  • Issue Number: 2
  • Publisher: Progressive Media Markets, Ltd
  • ISSN: 0041-414X

Subject/Index Terms

• TRT Terms: Collapsible soils; Ground settlement; Sinkholes; Tunnel borers
• Uncontrolled Terms: Earth pressure balance machine; Face pressure
• Geographic Terms: Canada; Singapore
• Subject Areas: Construction; Public Transportation;

Filing Info

• Accession Number: 00971561
• Record Type: Publication
• Source Agency: UC Berkeley Transportation Library
• Files: BTRIS, TRIS
• Created Date: Apr 1 2004 12:00AM