Time Domain Reflectometry

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Metallic Time Domain Reflectometry (MTDR) is a simple and economical way of detecting and interpreting rock and soil mass response to underground and surface mining using coaxial cables grouted in boreholes.

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Overview

Metallic Time Domain Reflectometry is a simple and economical way of detecting and interpreting rock and soil mass response to underground and surface mining using coaxial cables grouted in boreholes. MTDR can be used effectively to locate rock and soil mass movements.

MTDR involves the installation of a coaxial cable in a borehole filled with grout that matches existing soil or rock conditions. A TDR cable test unit is employed to generate a voltage pulse along the cable and receive reflections. Reflections are generated by cable deformations, abrasions and severing. Crimps at known locations along the cable are used to provide depth datum.

As movement occurs, the reflections along the cable change as the cable deforms. By connecting the cable tester to a PC through an RS232 cable, MTDR reflections can be interpreted by software, thereby inferring location, type and rate of earth movement. MTDR systems can be combined with data loggers and multiplexers to allow remote readings of multiple cables.


Time Domain Reflectometry is commonly used for:

  • Monitoring rock and soil movement.
  • Monitoring subsidence above abandoned underground mines.
  • High wall slope monitoring in open-pit mines.

View illustrations on how Time Domain Reflectometry is used for:

Time Domain Reflectometry Ordering Info

ITEM PART #
TDR Coaxial Cable with Connector Kit EL810918
FLEXDAQ Data Logger (with TDR200) Contact RST for details
Portable Time Domain Reflectometer ELGL3000

File Name

Time Domain Reflectometry

Resource Type

Brochure
Language Version Download
English MIB0010G
Portugese MIB0088A
Spanish MIB0604A

Speak with an Expert

I’m very happy with the quality of the instrumentation and technical support from RST, as always. They worked with us from the initial stages of the project to ensure that we were fully prepared and equipped to use the RSTAR network for the first time. They delivered everything within the tight project time frame to ensure that there were no delays on site, and the submersible tilt meters looked like new even after over twelve months of being submerged in Thames water!
 
-Richard Lipscombe, BEng (Hons), Director & Principle Consultant - RL Geotechnical Ltd