DISPLACEMENT MEASUREMENTS OF HIGH ACCURACY IN UNDERGROUND OPENINGS

Simple and reliable displacement measurements, as a means for the continuous observation of the behaviour of underground works during every construction phase, provide an indispensable help for a safe and economical execution. The displacement measurements enable to: (1) immediately verify the adequateness of the selected construction method and of the safety measures adopted; (2) determine, at an early stage, possible instabilities which cannot be detected visually; (3) draw conclusions about the overall rock quality with help of a stress analysis based upon an estimated or measured primary state of stress. Particularly useful information is obtained from the measurements of the displacements resulting from the excavation. The present paper deals with the problem of the practical execution of convergence measurements and also describes a recently developed precision instrument, the iseth-distometer, which is particularly adequate for use in underground works. Due to its simple operation, solid construction, reduced possibility of errors and adaptability to the difficult underground working conditions, this instrument has been successfully used in many instances.(a) /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00207624
• Corporate Authors:

  Pergamon Press, Incorporated

  Headington Hill Hall
  Oxford OX30BW,    
• Authors:
  • Kovari, K
  • AMSTAD, C
  • Grob, H
• Publication Date: 1976-3

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 445-450
• Serial:
  • International Journal of Rock Mechanics and Mining Science
  • Volume: 13
  • Issue Number: 3
  • Publisher: Pergamon Press, Incorporated
  • ISSN: 0020-7624

Subject/Index Terms

• TRT Terms: Construction management; Dislocation (Geology); Errors; Excavation; Excavations; Measurement; Measuring instruments; Motion; Rock mechanics; Rocks; Safety; Stability (Mechanics); Stresses; Structural analysis; Tunnels; Underground structures
• ITRD Terms: 6155: Apparatus (measuring); 3666: Construction method; 6440: Error; 5155: Excavation (process); 6136: Measurement; 5483: Movement; 4154: Rock; 5757: Rock mechanics; 5930: Stability; 5575: Stress (in material); 3374: Tunnel
• Subject Areas: Bridges and other structures; Construction; Geotechnology; Highways; Safety and Human Factors; I43: Rock Mechanics; I54: Construction of Tunnels;

Filing Info

• Accession Number: 00147450
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Analytic
• Files: ITRD, TRIS
• Created Date: Sep 20 1977 12:00AM