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Monitoring Slope Movement with Time Domain Reflect



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Monitoring Slope Movement with Time Domain Reflectometry


Article · January 2000


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William F. Kane KANE GeoTech, Inc.

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Presented at:
Geotechnical Field Instrumentation: Applications for Engineers and Geologists
Sponsored by: ASCE Seattle Section Geotechnical Group, and University of Washington Department of Civil Engineering
April 1, 2000


Monitoring Slope Movement with Time Domain Reflectometry

William F. Kane


KANE GeoTech, Inc.
P.O. Box 7526
Stockton, CA 95267-0526
Tel/Fax: 209-472-1822
Website: www.kanegeotech.com

ABSTRACT


Time domain reflectometry (TDR) is a method of locating the depth to a shear plane or zone in a landslide. TDR uses an electronic voltage pulse that is reflected like radar from a damaged location in a coaxial cable. To monitor slope movement, coaxial cables are grouted in boreholes and interrogated using a cable tester. Characteristic cable signatures can be stored and compared over time for changes, indicating slope movement. Advantages of using TDR over conventional servo-accelerometer probes include relatively low cost, time savings, immediate determination of slope movement, and the capability to monitor cables remotely using dataloggers and telemetry.

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