Interpretation of bender element test results using sliding Fourier transform method

Kumar, Jyant and Shinde, Ninad Sanjeev (2019) Interpretation of bender element test results using sliding Fourier transform method. In: CANADIAN GEOTECHNICAL JOURNAL, 56 (12). pp. 2004-2014.

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Abstract

Identification of the arrival point of the shear wave in bender element tests is a task that can have ambiguous results. The contamination of the received shear wave signal with a weak P-wave component, which can emerge either directly from the transmitter or reflect from the side boundary, makes the judgement involved in this task dubious. The different available procedures to mark the arrival times of the shear wave are often prone to errors. A method is proposed to identify the time of the arrival of the shear wave. The predominant frequency of the received signal is first evaluated and then, with the help of the sliding Fourier transform approach, the arrival of the shear wave is identified. The method does not require any manual intervention. The proposed approach is applied to bender element tests performed on dry and saturated sand and glass beads by varying (i) input frequency of the signal, (ii) confining pressure, and (iii) void ratio. Results for different cases, including those obtained by using resonant column tests, are found to be very promising.

Item Type:	Journal Article
Publication:	CANADIAN GEOTECHNICAL JOURNAL
Publisher:	CANADIAN SCIENCE PUBLISHING
Additional Information:	Copyright of this article belongs to CANADIAN SCIENCE PUBLISHING
Keywords:	bender elements; Fourier transform; shear wave velocity; wave propagation
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	20 Dec 2019 10:34
Last Modified:	20 Dec 2019 10:34
URI:	http://eprints.iisc.ac.in/id/eprint/64097

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