Smith and Dixon_CGJ_Manuscript_Accepted_19-07-14.pdf (1.03 MB)
Quantification of landslide velocity from active waveguide generated acoustic emission
journal contributionposted on 2014-10-16, 09:23 authored by Alister Smith, Neil Dixon
Acoustic emission (AE) has become an established approach to monitor stability of soil slopes. However, the challenge has been to develop strategies to interpret and quantify deformation behaviour from the measured AE. AE monitoring of soil slopes commonly utilises an active waveguide which is installed in a borehole through the slope and comprises a metal waveguide rod or tube with a granular backfill surround. When the host slope deforms, the column of granular backfill also deforms and this generates AE that can propagate along the waveguide. Presented in the paper are results from the commissioning of dynamic shear apparatus used to subject full scale active waveguide models to simulated slope movements. The results confirm that AE rates generated are proportional to the rate of deformation, and the coefficient of proportionality that defines the relationship has been quantified (e.g. 4.4 x 105 for the angular gravel examined). The authors demonstrate that slope velocities can be quantified continuously in real-time through monitoring active waveguide generated AE during a slope failure simulation. The results show that the technique can quantify landslide velocity to better than an order of magnitude (i.e. consistent with standard landslide movement classification) and can therefore be used to provide an early warning of slope instability through detecting and quantifying accelerations of slope movement.
- Architecture, Building and Civil Engineering
Published inCanadian Geotechnical Journal
CitationSMITH, A. and DIXON, N., 2014. Quantification of landslide velocity from active waveguide generated acoustic emission. Canadian Geotechnical Journal, 52(4), pp. 413-425.
PublisherNRC Research Press (© the authors)
- AM (Accepted Manuscript)
Publisher statementThis 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/