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Title: Quantification of slope displacement rates using acoustic emission monitoring
Authors: Dixon, Neil
Spriggs, M.P.
Keywords: Instrumentation
Acoustic emission
Slope instability
Issue Date: 2007
Publisher: © NRC Research Press
Citation: DIXON, N. and SPRIGGS, M.P., 2007. Quantification of slope displacement rates using acoustic emission monitoring. Canadian Geotechnical Journal, 44 (8), pp. 966-976.
Abstract: In soil slopes, developing shear surfaces generate acoustic emission (AE). The Authors have previously proposed the use of active waveguides for monitoring the stability of such slopes. Active waveguides comprise of a steel tube installed in a preformed borehole through a slope with coarse grained soil backfill placed in the annulus around the tube. Deformation of the host soil generates AE in the active waveguide. Field trials of this system reported previously have shown that AE rates are linked to slope deformation rates. This paper extends the study by detailing a method for quantifying slope movement rates using an active waveguide. A series of laboratory experiments are presented and used to define the relationship between AE event count rate and displacement rate. The method was shown to differentiate rates within an order of magnitude, which is consistent with standard landslide movement classification (i.e. 1 to 0.001 mm per minute), using a relationship derived between the gradient of the event count rate with time and deformation rate. In addition, it was possible to detect a change in displacement rate within two minutes of it occurring even at very slow rates (i.e. 0.0018mm/min). Knowledge of changes in displacement rate is important in situations where slope movements are suddenly triggered or displacements accelerate in response to a destabilising event. Field trials of a realtime AE monitoring system are currently in progress to compare performance against traditional instrumentation.
Description: This is an article that appeared in the journal, Canadian Geotechnical Journal [© NRC Research Press] it is also available at: http://pubs.nrc-cnrc.gc.ca No part of the NRC Research Press electronic journals may be reproduced, stored, or transmitted in any form or by any means, without the written permission of the publisher, except as stated below. Under the Canadian Copyright Act, individuals may download or print single copies of articles for personal research or study. Any person may reproduce short excerpts from articles in the journals for any purpose that respects the moral rights of authors, provided that the source is fully acknowledged. As a courtesy, the consent of authors of such material should be obtained directly from the author. Authorization to reproduce items for other than personal research or study, as stated above, may be obtained via Access © upon payment of the copyright fee of $10.00 per copy. NRC Research Press also extends certain additional rights to authors. (see Authors' Rights) The above rights do not extend to copying or reproduction for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. For such copying or reproduction, arrangements must be made with NRC Research Press.
Version: Accepted for publication
URI: https://dspace.lboro.ac.uk/2134/4374
ISSN: 1208-6010
Appears in Collections:Published Articles (Architecture, Building and Civil Engineering)

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