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Acoustic emission monitoring of active waveguides to quantify slope stability

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conference contribution
posted on 16.10.2014 by Alister Smith, Neil Dixon
The active waveguide is installed in a borehole that penetrates stable stratum below any shear surface or potential shear surface that may form beneath a slope. It comprises a metal waveguide rod or tube that provides a low resistance path for acoustic emission to travel from the source at the shear surface to the sensor at the ground surface. The annulus surrounding the waveguide is backfilled with granular soil. When the host slope deforms, the column of granular soil also deforms and this induces inter-particle friction and releases relatively high levels of acoustic emission that can propagate along the waveguide. Field trials and laboratory experiments reported by the authors have demonstrated that acoustic emission rates generated by active waveguides are proportional to the velocity of slope movement. This summary describes the operation of the active waveguide and Slope ALARMS acoustic emission sensor for use in slope stability monitoring. An on-going research project aiming to develop an algorithm that can quantify slope displacement rates through monitoring active waveguide generated acoustic emission is introduced.

History

School

  • Architecture, Building and Civil Engineering

Published in

13th BGA Young Geotechnical Engineers’ Symposium http://www.icevirtuallibrary.com/upload/journals/YGES2014.pdf

Pages

17 - 18 (2)

Citation

SMITH, A. and DIXON, N., 2014. Acoustic emission monitoring of active waveguides to quantify slope stability. IN: Lam, C. and Syed, M.A. (eds). Proceedings, Thirteenth BGA Young Geotechnical Engineers’ Symposium, 30th June 2014 - 2nd July 2014, University of Manchester, pp.17-18.

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2014

Notes

This is a conference paper.

Language

en

Location

University of Manchester

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