Abstract
Differential ground settlement is a key parameter to be monitored in engineering practices. The common instruments and techniques available for surface and subsurface settlement measuring, such as surface surveying, settlement platforms, extensometer, inclinometers, and so on, provide point-specific measurements. The number of data points obtained by these methods is pre-determined by the number of the measuring points, and hence the spatial resolution of the measuring system is limited. This paper presents the development of a tension-sensitive time domain reflectometry (TDR) sensor and the experimental program to evaluate its performance for monitoring soil settlement. Testing results show that the looped TDR cable is highly sensitive to tension and effective in detecting subsidence zone in sand.
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