Looped Sensors to Measure Differential Settlement by Time Domain Reflectometry

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.

• Periodical: Advanced Materials Research (Volumes 639-640)
• Pages: 1148-1154
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.639-640.1148
• Online since: January 2013
• Authors: Zheng Lai Xu, Charles E. Pierce
• Keywords: Differential Settlement, Looped Cable, Monitoring, Time Domain Reflectometry (TDR)

References

[1] J. Dunnicliff, Geotechnical Instrumentation for Monitoring Field Performance, John Wiley and Sons, New York, 1993.

[2] C.E. Pierce, Y. Fujiyasu and C.M. McAlister, Measuring Non-localized Soil Deformation using Time Domain Reflectometry, Proceedings of TRB 81st Annual Meeting, Transportation Research Board, Washington, D.C., January, (2002) 1-22.

[3] K.M. O'Connor and C.H. Dowding, Geomeasurements by pulsing TDR cables and probes. Boca Raton: CRC Press LLC., 1999.

DOI: 10.1201/9781003067726