oa Civil Engineering = Siviele Ingenieurswese - Rapid slope monitoring

Volume 5, Issue 3
  • ISSN : 1021-2000



A cost-effective method for monitoring unstable slopes - time-domain reflectometry - has the added advantage of being quicker and safer than the use of conventional instruments Using inexpensive coaxial cables rather than inclinometers has cut the cost of monitoring slope movement at seven potential landslide sites in California. The method involved is called time-domain reflectometry (TDR). The principle involved is fairly simple: when a coaxial cable is deformed, its impedance characteristics change. The cost at one site plummeted again when engineers began reading the TDR data by remote telemetry last year. A TDR system had been installed after a slide disrupted traffic during the winter of 1995. The original installation was considered experimental, as the cables were piggy-backed onto the inclinometer casings and piezometers installed in three 91,4 m deep boreholes drilled at the site.

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