Bender elements: Performance and signal interpretation

Jong Sub Lee, J. Carlos Santamarina

Research output: Contribution to journalArticlepeer-review

433 Citations (Scopus)

Abstract

Bender elements are convenient shear wave transducers for instrumenting soil cells due to optimal soil-transducer coupling and compatible operating frequency. Experimental and analytical methods are implemented in this study to explore various aspects of bender element installations including: electromagnetic coupling prevention, directivity, resonant frequency, detection of first arrival, and near field effects. It is shown that electromagnetic coupling effects are critical in soils with high electrical conductivity and can be minimized by shielding and grounding, or by using parallel-type bender elements. Bender elements generate both P- and S-waves. The in-plane S-wave directivity is quasicircular. The resonant frequency of bender element installations depends on the geometry of the bender element, the anchor efficiency, and the soil stiffness. The cross correlation of subsequent reflections is a self-healing measurement procedure which resolves uncertainties in both travel time and travel distance. Near field effects can be effectively taken into consideration by matching the measured signal with the analytical solution, directly rendering shear wave velocity. Journal of Geotechnical and Geoenvironmental Engineering

Original languageEnglish
Pages (from-to)1063-1070
Number of pages8
JournalJournal of Geotechnical and Geoenvironmental Engineering
Volume131
Issue number9
DOIs
Publication statusPublished - 2005 Sep

Keywords

  • Analytical techniques
  • Coupling
  • Resonance
  • Shear waves
  • Signal processing
  • Wave reflection

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Environmental Science(all)

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