Fiber-optic high-resolution acoustic emission (AE) monitoring of slope failure

Michlmayr, Gernot; Chalari, Athena; Clarke, Andy; Or, Dani

doi:10.1007/s10346-016-0776-5

Cited by 61 publications

(42 citation statements)

References 16 publications

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“…Controlled laboratory conditions offer the possibility to entirely manage the process under study and thus the effect of single stability governing parameters could be examined. Such experiments have been carried out with various objectives, such as validating stability models and testing monitoring instrumentation, e.g., [17,20,21] even though due dimensional analysis is seldom carried out [22].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Role of Water for the Stability of Shallow Landslides—Insights from Experimental Tests

Ivanov

Arosio

Tresoldi

et al. 2020

Water

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Shallow soil slips are a significant hydrogeological hazard which could affect extended areas of the high-gradient mountainous landscape. Their triggering is highly dependent on the rainfall water infiltration and its further redistribution, as well as the characteristic properties of the soil itself. The complex interaction between those factors generates a considerable degree of uncertainty in the understanding of the governing processes. In this work, we take a small step further towards the untangling of those intricate relationships through observation. The results of a set of 20 downscaled shallow land mass failures are analysed through a principal component analysis and a further detailed look at the resulting parametric trends. Moreover, electrical resistivity tomography measurements are added up to the interpretation of experimental data, by providing a glimpse on the rainfall water infiltration process at the subsurface level. The outcome of this work implies that the coupled interaction between rainfall intensity, hydraulic conductivity and soil moisture gradient is governing the stability of soil and while rainfall intensity and duration are essential instability predictors, they must be integrated with antecedent moisture and site-specific characteristics. A tentative comparison of the dataset with existing rainfall thresholds for shallow landslide occurrence suggests the potential application of experimental tests for thresholds' definition or validation under the appropriate dimensional analysis. A dimensional analysis indicated the interconnection of parameters intrinsic to the problem, and the significance of scale effects in performing a downscaled simulation of land mass failure.

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Section: Introductionmentioning

confidence: 99%

Investigation on the Role of Water for the Stability of Shallow Landslides—Insights from Experimental Tests

Ivanov

Arosio

Tresoldi

et al. 2020

Water

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“…However, recent research and advances in instrumentation have resulted in successful applications using AE to monitor soil slope stability (Berg et al 2018;Dixon et al 2015aDixon et al , 2015bSmith and Dixon 2015;Smith et al 2014Smith et al , 2017a. This body of work has proven that monitoring AE can be used to provide an early warning of slope instability by detecting both the development of shear surfaces and accelerating deformation behaviour (Chichibu et al 1989;Fujiwara et al 1999;Koerner et al 1981;Michlmayr et al 2017;Nakajima et al 1991;Smith et al 2017a). …”

Section: Introductionmentioning

confidence: 99%

An acoustic emission landslide early warning system for communities in low-income and middle-income countries

et al. 2018

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Early warning systems for slope instability are needed to alert users of accelerating slope deformation behaviour, enable evacuation of vulnerable people, and conduct timely repair and maintenance of critical infrastructure. Communities exposed to landslide risk in low-and middle-income countries seldom currently instrument and monitor slopes to provide a warning of instability because existing techniques are complex and prohibitively expensive. Research and field trials have demonstrated conclusively that acoustic emission (AE) monitoring can be an effective approach to detect accelerating slope movements and to subsequently communicate warnings to users. The objective of this study was to develop and assess a simple, robust, low-cost AE monitoring system to warn of incipient landslides, which can be widely deployed and operated by communities globally to help protect vulnerable people. This paper describes a novel AE measurement sensor that has been designed and developed with the cost constrained to a few hundred dollars (US). Results are presented from physical model experiments that demonstrate performance of the AE system in measuring accelerating deformation behaviour, with quantifiable relationships between AE and displacement rates. Exceedance of a pre-determined trigger level of AE can be used to communicate an alarm to users in order to alert them of a slope failure. Use of this EWS approach by communities worldwide would reduce the number of fatalities caused by landslides.

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“…Michlmayr et al [217] confirmed the feasibility of the approach by testing the technology in a small-scale flume with coil-like deployment. Real-time handling of a large amount of data produced was recognised as one of the main challenges to be addressed before the technology can be used for early warning purposes.…”

Section: Other Distributed Sensing Approaches For Slopes and Landslidmentioning

confidence: 55%

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

2017

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Featured Application: Distributed fibre optic sensors for geo-hydrological applications: a comprehensive review about methodology, weaknesses, and strengths.Abstract: Distributed optical fibre sensing, employing either Rayleigh, Raman, or Brillouin scattering, is the only physical-contact sensor technology capable of accurately estimating physical fields with spatial continuity along the fibre. This unique feature and the other features of standard optical fibre sensors (e.g., minimal invasiveness and lightweight, remote powering/interrogating capabilities) have for many years promoted the technology to be a promising candidate for geo-hydrological monitoring. Relentless research efforts are being undertaken to bring the technology to complete maturity through laboratory, physical models, and in-situ tests. The application of distributed optical fibre sensors to geo-hydrological monitoring is here reviewed and discussed, along with basic principles and main acquisition techniques. Among the many existing geo-hydrological processes, the emphasis is placed on those related to soil levees, slopes/landslide, and ground subsidence that constitute a significant percentage of current geohazards.

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Fiber-optic high-resolution acoustic emission (AE) monitoring of slope failure

Cited by 61 publications

References 16 publications

Investigation on the Role of Water for the Stability of Shallow Landslides—Insights from Experimental Tests

Investigation on the Role of Water for the Stability of Shallow Landslides—Insights from Experimental Tests

An acoustic emission landslide early warning system for communities in low-income and middle-income countries

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

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