Performance Analysis of Piezo-Ceramic Elements in Soils |
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Authors: | A Patel D N Singh K K Singh |
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Institution: | (1) Department of Civil Engineering, Geotechnical Engineering Division, Indian Institute of Technology Bombay, Powai, Mumbai, 400 076, India; |
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Abstract: | The application of piezo-ceramic elements for measuring shear and compression wave velocities in the soil mass is increasing
day-by-day. Depending upon the configuration and polarity, these elements can either be used as benders or extenders, which
can transmit and receive shear and compression waves, respectively. Though, several researchers have successfully employed
these elements for characterizing the soil mass based on the shear and compression wave velocities, determination of the “time
lag” between the input and output waves remains debatable. Even, the existing literature does not clearly present the response
of these elements with respect to the frequency of excitation and the type of the material to be characterized. With this
in view, extensive investigations were made to capture the performance of piezo-ceramic elements by changing their (a) wiring
configuration (i.e., series or parallel) and (b) polarization (i.e., same or opposite) in the compacted soils of different
characteristics (i.e., moisture content, dry density and type of the soil). Details of the methodology are presented in this
paper and special attention has been paid to address various problems (i.e., wave attenuation, crosstalk phenomena, near field
effect and overshooting of transmitting waves) that are associated with signal interpretation and may yield misleading results. |
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