Using TDR Cables and GPS for Landslide Monitoring in High Mountain Area
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 135, Issue 8
Abstract
Time domain reflectometry (TDR) is performed as a complement to the monitoring methods in subsurface deformation in slope together with the global positioning system (GPS) to monitor ground deformation of high-altitude landslides in Li-shan. Four TDR cables were installed in drill holes near the monitoring stations in the landslide area. According to the recorded TDR waveforms, there were shear and tensile zones under the B-5, B-9, C-1, and C-2 stations. A comparison of the TDR waveforms with the monitored data and boring log revealed that the subsurface sliding occurred between layers of colluvium and strongly weathered slate. Three GPS receivers were installed to measure ground displacement in the landslide area. The results from the GPS were compared with the surface extensometers data on-site. The two initial baseline lengths were 451,188.10 and , respectively. The optimal data reduction achieved used a session with moving average for each hour’s GPS data. The standard deviation values of the GPS were 2.16 and , respectively, on-site. The results of TDR and GPS measurements showed their applicability in the deformation monitoring of high-mountain landslides.
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Acknowledgments
The work presented in this paper was made possible through the support of the Soil and Water Conservation Bureau, Taiwan, R.O.C. The subsequent working projects were proposed and approved by the Technical Counseling Committee on Renovation Work of the Li-shan Landslide area, the Soil and Water Conservation Bureau, the Agricultural Commission, and Executive Yuan. The items in the project were arranged and listed by the Soil and Water Conservation Bureau, and the performance evaluation of each item was also periodically reviewed annually.
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Information & Authors
Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 135 • Issue 8 • August 2009
Pages: 1113 - 1121
Copyright
© 2009 ASCE.
History
Received: Aug 29, 2007
Accepted: Nov 24, 2008
Published online: Jul 15, 2009
Published in print: Aug 2009
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