Development of a Time Domain Reflectometry System to

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					                                    Technical Report Documentation Page

1. REPORT No.                       2. GOVERNMENT ACCESSION No.                  3. RECIPIENT'S CATALOG No.

4. TITLE AND SUBTITLE                                                     5. REPORT DATE
Development of a Time Domain Reflectometry System to                      June 1996
Monitor Landslide Activity
                                                                          6. PERFORMING ORGANIZATION

William F. Kane, Hernan Perez, Neil O. Anderson                           8. PERFORMING ORGANIZATION REPORT No.

9. PERFORMING ORGANIZATION NAME AND ADDRESS                               10. WORK UNIT No.
University of the Pacific
3601 Pacific Avenue
Stockton, CA 95211                                                        11. CONTRACT OR GRANT No.

                                                                          13. TYPE OF REPORT & PERIOD COVERED
12. SPONSORING AGENCY NAME AND ADDRESS                                    Final: Jul 1994-Jun 1996
California Department of Transportation
                                                                          14. SPONSORING AGENCY CODE
Office of Structural Foundations
5900 Folsom Boulevard

    The results of a research project to investigate the use of time domain reflectometry (TDR) to monitor landslide movement are
reported here. The use of coaxial cables and TDR to monitor Earth movements is relatively new. This method uses the changes in
the signature of a voltage pulse traveling along a coaxial cable grouted into a borehole. In this research, three coaxial cables
(RG59/U) were grouted into boreholes in the Grapevine landslide, Kern County, California adjacent to Interstate Highway 5.
    The TDR literature pertaining to geotechnical applications was reviewed. A computer, cable testers, software, and equipment for
remote data acquisition of TDR data were procured and assembled. In addition, laboratory testing of RG59/U cable was performed
to determine strength and deformation characteristics.
    The final product provides Caltrans with an alternative, economical means of monitoring landslide movement. The advantages of
using TDR are its relative ease of installation, rapid data collection, low long-term costs, and remote data acquisition capability.

Time domain reflectometry, landslides, monitoring

18. No. OF PAGES:           19. DRI WEBSITE LINK


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