EARLY DETECTION OF ROCK MOVEMENT WITH TIME DOMAIN REFLECTOMETRY

This paper summarizes results of a real-time, remotely controlled time domain reflectometry (TDR) monitoring program to demonstrate the effectiveness of remote polling for early detection of rock-mass deformation. During field testing, TDR data were related to shear deformation above a longwall caving operation using a correlation between the signature reflection coefficient and shear deformation established through laboratory measurements. A 175-m vertical coaxial TDR cable was grouted into the rock mass above the longwall coal-mining operation and attached to the aboveground-pulsing instrument. Results of the TDR measurements were compared with surface movements and overburden geology. Special attention was devoted to the effects, as measured in the laboratory, of cable length, cable diameter, and shear-zone width.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/07339410
• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Dowding, C H
  • Huang, F-C
• Publication Date: 1994-8

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 1413-27
• Serial:
  • Journal of Geotechnical Engineering
  • Volume: 120
  • Issue Number: 8
  • Publisher: American Society of Civil Engineers
  • ISSN: 0733-9410

Subject/Index Terms

• TRT Terms: Deformation; Instrumentation; Laboratory tests; Mass; Real time control; Remote control; Rocks; Time domain reflectometers
• Uncontrolled Terms: Rock mass
• Old TRIS Terms: Deformation analysis; Real-time systems; Remote control systems
• Subject Areas: Geotechnology; Highways; I43: Rock Mechanics;

Filing Info

• Accession Number: 00665995
• Record Type: Publication
• Files: TRIS
• Created Date: Sep 10 1994 12:00AM