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Time Domain Reflectometry Measurement of Shear Displacements in Slope Failure Model Tests
Slope failures resulting from seismic events are unfortunate yet relatively common occurrences. Subsurface deformation patterns in failing slopes can be studied using physical models, but it requires relatively small and non-intrusive sensing instrumentation. Time domain reflectometry (TDR) technology, which has been successfully applied to field monitoring of unstable slopes during the past two decades, offers a diverse monitoring tool for physical models, particularly for tracking localized shear deformations with an embedded sensor array. This paper presents the setup and results of 1-g slope failure model tests to demonstrate the capability of TDR to capture localized shear deformation. Two prototype coaxial cables, one grouted and the other ungrouted, were installed full depth as TDR sensors. Experimental results show that grouted and ungrouted sensors accurately locate the failure surface after sliding commences. For the same soil conditions, a grouted sensor produces a higher rate of reflection during sliding than an ungrouted sensor because the interaction length across the shear zone is minimized.
Time Domain Reflectometry Measurement of Shear Displacements in Slope Failure Model Tests
Slope failures resulting from seismic events are unfortunate yet relatively common occurrences. Subsurface deformation patterns in failing slopes can be studied using physical models, but it requires relatively small and non-intrusive sensing instrumentation. Time domain reflectometry (TDR) technology, which has been successfully applied to field monitoring of unstable slopes during the past two decades, offers a diverse monitoring tool for physical models, particularly for tracking localized shear deformations with an embedded sensor array. This paper presents the setup and results of 1-g slope failure model tests to demonstrate the capability of TDR to capture localized shear deformation. Two prototype coaxial cables, one grouted and the other ungrouted, were installed full depth as TDR sensors. Experimental results show that grouted and ungrouted sensors accurately locate the failure surface after sliding commences. For the same soil conditions, a grouted sensor produces a higher rate of reflection during sliding than an ungrouted sensor because the interaction length across the shear zone is minimized.
Time Domain Reflectometry Measurement of Shear Displacements in Slope Failure Model Tests
Xu, Z. (Autor:in) / Pierce, C. E. (Autor:in)
GeoShanghai International Conference 2006 ; 2006 ; Shanghai, China
Advances in Earth Structures ; 74-82
11.05.2006
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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