Photographic feature: Acoustic emission monitoring of coastal slopes in NE England, UK

Smith, Alister; Dixon, Neil; Moore, Roger; Meldrum, Philip

doi:10.1144/qjegh2016-081

Cited by 9 publications

(5 citation statements)

References 9 publications

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“…A rapid increase of acceleration indicates slope failure may occur soon. Thus, detection and quantification of acceleration may provide early warning of slope failure [ 13 , 64 , 65 , 66 ]. Figure 10 shows the thrust and acceleration time series.…”

Section: Results and Analysismentioning

confidence: 99%

Correlation between Acoustic Emission Behaviour and Dynamics Model during Three-Stage Deformation Process of Soil Landslide

Deng

Yuan

Chen

et al. 2021

Sensors

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Acoustic emission (AE) monitoring has become an optional technology to quantify slope deformation. However, there are still challenges in developing generic AE interpretation strategies. Dynamics and kinematics models are two physical methods for analysing slope stability, which appear to improve the interpretability of AE monitoring data. The aim of this study is to explore the change patterns and interrelations of dynamics, kinematics, and AE measurements using a model test and physical analysis, to further understand the development process of a progressive landslide. A model test is designed based on the kinematics model of landslide three-stage deformation. An equation between factor of safety (FoS) and thrust is proposed based on the mechanical model of a landslide test. There is a clear correspondence between the displacement and inverse velocity during the deformation-controlled process. Relationships are uncovered between the thrust and FoS as well as the thrust and acceleration. As a characteristic parameter of AE, ring down count (RDC) is able to quantify the deformation process of the soil slope. Moreover, acceleration and RDC can reflect the sudden change of the slope state and, hence, can be effective indicators for the early warning in a progressive landslide.

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Section: Results and Analysismentioning

confidence: 99%

Correlation between Acoustic Emission Behaviour and Dynamics Model during Three-Stage Deformation Process of Soil Landslide

Deng

Yuan

Chen

et al. 2021

Sensors

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“…In terms of active AE waveguide and a large-deformation bolt, their feasibility for field installation and the reliability for landslide monitoring have been sufficiently investigated and extensively tested, respectively [8,[23][24][25]27,28,38,39,41]. The proposed device integrates the structure of a large-deformation bolt into active waveguide.…”

Section: Discussionmentioning

confidence: 99%

Experimental Investigation on Integrated Subsurface Monitoring of Soil Slope Using Acoustic Emission and Mechanical Measurement

et al. 2021

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Compared with slope surface measurement, subsurface monitoring has the potential to detect abnormal changes at an earlier stage. Due to the large-scale deformation of landslides and the complex geological environment, the existing subsurface devices generally have limited measuring range or high economic cost. Thus, it is urgent to develop an advanced method to improve the sustainable monitoring of large subsurface deformation. In this study, a novel flexible device is designed for slope subsurface monitoring, which combines an active waveguide of acoustic emission and the distinctive structure of a large-deformation bolt. An experimental system is built and a loading process of three-stage deformation is carried out to test the performance of the flexible device. The kinematic, mechanical and acoustic emission parameters are synchronously obtained in the whole landslide model test. The results indicate that different evolution stages of a landslide can be distinguished by sliding acceleration. The axial tension within the anchor cable changes consistently with sliding thrust. In addition, using acoustic emission to quantify slope deformation has achieved strong correlation. An extra experiment with constant velocity is conducted to explore the precision of deformation quantification by acoustic emission. A schematic diagram is presented for how this novel device would be used for landslide monitoring in the field, with the potential practicability of stabilizing the slope.

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“…The current investigation is only to establish some relationships that can help real-time monitoring and damage detection for largescale underground structures. An increase in dimensions of utility tunnel is expected to increase the magnitude of AE signals, since macro-cracks can propagate to a much larger scale, showing more released energy [38,41].…”

Section: Instrumentationmentioning

confidence: 99%

Time Series Analysis of Acoustic Emissions in Prefabricated Utility Tunnel During the Sealing Test

Lin

Deng

et al. 2020

Int. J. of Geosynth. and Ground Eng.

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Utility tunnel is increasingly applied for underground space development, and its health monitoring becomes attractively important. The acoustic emission (AE) technology is often used for damage monitoring of small-scale specimens made of concrete or rock in the laboratory. In this study, the AE technology is adopted to instrument a novel prefabricated utility tunnel to provide insights into the leakage behavior of the structure during the sealing test. Filtering is conducted on AE data to eliminate the influence of noise interference, especially for data in the pressurization stage. The traditional ring-down count and AE energy are determined from eigenvalue analysis of AE events. It is found that these conventional calculations can be well related to the pattern of internal water pressure, and the Felicity effect is found in the loading process. Furthermore, time series analysis is carried out for each specific pressurization or pressure-holding stage during the sealing test, in which the b-value (an important mean to study the characteristics of AE signal) is evaluated. Results show that the b-value can also be used as a prediction basis for pre-alarming monitoring before the occurrence of seepage failure for utility tunnel.

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Photographic feature: Acoustic emission monitoring of coastal slopes in NE England, UK

Cited by 9 publications

References 9 publications

Correlation between Acoustic Emission Behaviour and Dynamics Model during Three-Stage Deformation Process of Soil Landslide

Correlation between Acoustic Emission Behaviour and Dynamics Model during Three-Stage Deformation Process of Soil Landslide

Experimental Investigation on Integrated Subsurface Monitoring of Soil Slope Using Acoustic Emission and Mechanical Measurement

Time Series Analysis of Acoustic Emissions in Prefabricated Utility Tunnel During the Sealing Test

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