APPLICATION OF Q-SYSTEM IN DESIGN DECISIONS CONCERNING DIMENSIONS AND APPROPRIATE SUPPORT FOR UNDERGROUND INSTALLATIONS

Recent applications of the q-system of rockmass classification are given. It is shown that four potential storage sites with different rockmass conditions may have different optimal cavern dimensions. Support costs may increase disproportionately if dimensions are chosen that are smaller or larger than the theoretical optimum of 18 to 24 metres span. The q-system is also used for mapping rockmass conditions during tunnel and cavern construction to aid in the choice of permanent support. Examples include 25 M2 and 162 M2 headrace tunnels and an underground sewage treatment plant constructed in 1 km of caverns, 16 M in span. Mapping of associated collector and outlet tunnels is also illustrated. The former is being excavated by full-face tunnel boring machines. Finally it is shown how the q-value can give a preliminary estimate of the in situ deformation modulus and the range of likely deformations.(a) for the covering abstract of the conference see IRRD 271697.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0080261361
• Supplemental Notes:
  • Subsurface Space. Environment Protection, Low Cost Storage, Energy Savings. Proceedings.
• Corporate Authors:

  Pergamon Press, Incorporated

  Headington Hill Hall
  Oxford OX30BW,    
• Authors:
  • Barton, N
  • Loeset, F
  • Lunde, J
• Publication Date: 1980

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 553-561
• Serial:
  • Publication of: Pergamon Press Limited
  • Publisher: Pergamon Press, Incorporated

Subject/Index Terms

• TRT Terms: Boring; Classification; Conferences; Construction management; Deformation; Excavating equipment; Excavation; Excavation and tunneling; Excavations; Full face tunneling; Geology; Physical properties; Quality control; Rocks; Size; Structural design; Structural supports; Tunnel supports; Tunneling; Tunneling machines; Tunnels; Underground structures
• Uncontrolled Terms: Cavities; Quality; Subterranean; Support (Tunnel); Tunnel design
• Old TRIS Terms: Rock properties; Rock tunneling; Supports
• ITRD Terms: 5738: Cavity; 8513: Classification; 8525: Conference; 3666: Construction method; 5595: Deformation; 9014: Dimension; 5155: Excavation (process); 3383: Full face tunnelling machine; 9063: Quality; 4154: Rock; 4372: Subterranean; 3605: Timbering; 3374: Tunnel
• Subject Areas: Bridges and other structures; Construction; Design; Geotechnology; Public Transportation; I25: Design of Tunnels; I54: Construction of Tunnels;

Filing Info

• Accession Number: 00381442
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• ISBN: 0-08-026136-1
• Files: ITRD, TRIS
• Created Date: Feb 29 1984 12:00AM