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Acoustic emission behaviour of dense sands

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journal contribution
posted on 15.01.2019, 10:14 by Alister SmithAlister Smith, Neil DixonNeil Dixon
Interpretation of acoustic emission (AE) generated by particulate materials has to date been qualitative. The objective of this study was to move the discipline towards quantitative interpretation of AE to: enable early warning of serviceability and ultimate limit state failures in the field, and enhance the instrumentation of element and physical model tests in the laboratory. Results from a programme of drained triaxial tests on dense sands show that: AE generation is proportional to the imposed stress level, imposed strain rate, fabric coordination number and boundary work done; there are two types of AE response at the transition from contractive to dilative behaviour, which was governed by the mean particle size; and AE activity in particulate materials is negligible until the current stress conditions (compression and/or shear) exceed the maximum that has been experienced in the past. Relationships have been quantified between AE and boundary work (i.e. AE generated per Joule) for a unit volume of sand under isotropic compression and shear, and between AE and shear strain rate. An example interpretation framework demonstrates how AE measurements could be used to identify the transition from contractive to dilative behaviour, mobilisation of peak shear strength and quantify accelerating deformation behaviour that typically accompanies shear zone development.

Funding

Alister Smith gratefully acknowledges the support of an EPSRC Fellowship (Listening to Infrastructure, EP/P012493/1).

History

School

  • Architecture, Building and Civil Engineering

Published in

Géotechnique

Volume

69

Issue

12

Pages

1107 - 1122

Citation

SMITH, A. and DIXON, N., 2019. Acoustic emission behaviour of dense sands. Geotechnique, 69 (12), pp.1107-1122.

Publisher

ICE Publishing

Version

VoR (Version of Record)

Publisher statement

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Acceptance date

04/01/2019

Publication date

2019-02-05

Copyright date

2019

ISSN

0016-8505

eISSN

1751-7656

Language

en