Measuring Travel Time in Bender/Extender Element Tests

Hasan, A.M. and Wheeler, S.J. (2015) Measuring Travel Time in Bender/Extender Element Tests. In: 16th European Conference on Soil Mechanics & Geotechnical Engineering, Edinburgh, UK, 13-17 Sept 2015, pp. 3171-3176.

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Four different interpretation procedures (involving both time and frequency domains) have been examined for measuring travel times in bender/extender element tests, used for measurement of shear and compression wave velocities and hence elastic shear modulus and elastic constrained modulus, respectively. Tests were conducted on unsaturated samples of speswhite kaolin produced by an isotropic form of compaction, fitted with three pairs of bender/extender elements, two transmitting horizontally across the sample (with either vertical or horizontal polarisation of the shear waves) and one transmitting vertically. It was concluded that, for both shear and compression wave velocities, the procedure of determining travel time from a peak-to-first peak measurement in the time domain was the most reliable. This method, unlike the other three, provided a wave velocity that was almost frequency-independent (over an appropriate frequency range) and it also provided equal shear wave or compression wave velocities in different directions in these isotropic samples.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Hasan, Mr Ahmed Mohammed and Wheeler, Professor Simon
Authors: Hasan, A.M., and Wheeler, S.J.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
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