Acoustic Emission/Microseismic Source Location in Geotechnical Applications

Hardy, H. Reginald; Belesky, Robert M.; Ge, Mao Chen

doi:10.1016/b978-0-08-036221-2.50101-7

Cited by 15 publications

(25 citation statements)

References 3 publications

(2 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In this case, it must be considered that several location methods can be found in literature, but their use requires that the sensors have specific characteristics, or are in sufficient number and spatial distribution (Hardy, 2003). In particular, the number and type of sensors have to be chosen in accordance with the results that are required.…”

Section: Characteristics Of a Microseismic Monitoring Systemmentioning

confidence: 99%

“…However, it is known that the overall monitoring system necessary for each field project is "sitespecific"; this means that the consideration of the specific site conditions is involved in the selection of the most suitable transducers, installation technique and array geometry (Hardy, 2003).…”

Section: Characteristics Of a Microseismic Monitoring Systemmentioning

confidence: 99%

“…In particular, the number and type of sensors have to be chosen in accordance with the results that are required. A minimum of four uniaxial transducers are required for epicentre location (location in the horizontal plane), leaving the source depth undetermined, and a minimum of five uniaxial transducers is required for three dimensional or hypocentre location (Hardy, 2003). Single triaxial geophones can be used for locating sources applying the polarization technique (Kolesnikov et al, 2003).…”

Section: Characteristics Of a Microseismic Monitoring Systemmentioning

confidence: 99%

“…v=10 −7 m/s in some cases) and, thus, extremely high gain systems are required to convert these signals to useable electronic signal levels (normally 1-10 V) (Hardy, 2003).…”

Section: Characteristics Of a Microseismic Monitoring Systemmentioning

confidence: 99%

See 3 more Smart Citations

Microseismic activity analysis for the study of the rupture mechanisms in unstable rock masses

Amitrano

Arattano

Chiarle

et al. 2010

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. Rockfalls are common instabilities in alpine areas and can cause significant damage. Since high mountains have been affected by an increasing number of these phenomena in the last years, a possible correlation with permafrost degradation induced by climate change has been hypothesized.To investigate this topic, a monitoring system, made of 5 triaxial geophones and 1 thermometer, was installed in 2007 at the Carrel hut (3829 m a.s.l., Matterhorn, Northwestern Alps), in the frame of the Interreg IIIA Alcotra project n. 196 "Permadataroc".The preliminary data processing relates to the classification of recorded signals, the identification of the significant microseismic events and the analysis of their distribution in time and space. The first results indicated a possible correlation between clusters of events and temperature trend, and a concentration of events in specific sectors of the rock mass.Research is still in progress. The recording of data for a longer period is planned to fully understand seasonal trends and spatial distribution of microseismic activity, and possible relations with permafrost degradation. Nevertheless, the preliminary observations prove that the monitoring system can detect noises generated by rock slope deformation. Once fully developed, this technique could become a helpful tool for early warning and preliminary stability assessments.

show abstract

Section: Characteristics Of a Microseismic Monitoring Systemmentioning

confidence: 99%

Section: Characteristics Of a Microseismic Monitoring Systemmentioning

confidence: 99%

Section: Characteristics Of a Microseismic Monitoring Systemmentioning

confidence: 99%

“…v=10 −7 m/s in some cases) and, thus, extremely high gain systems are required to convert these signals to useable electronic signal levels (normally 1-10 V) (Hardy, 2003).…”

Section: Characteristics Of a Microseismic Monitoring Systemmentioning

confidence: 99%

See 2 more Smart Citations

Microseismic activity analysis for the study of the rupture mechanisms in unstable rock masses

Amitrano

Arattano

Chiarle

et al. 2010

Nat. Hazards Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…Acoustic emissions (AEs) are transient elastic waves generated by the rapid release of energy within a material (Hardy, 2003). Most of the processes that generate AEs are related to an increase of material damage (Lockner et al, 1991;Scholz, 1968), such as crack formation, friction between solid surfaces, or grain motion/rearrangements in granular materials.…”

Section: Introductionmentioning

confidence: 99%

A custom acoustic emission monitoring system for harsh environments: application to freezing-induced damage in alpine rock walls

Girard

Beutel

Gruber

et al. 2012

Geosci. Instrum. Method. Data Syst.

View full text Add to dashboard Cite

Abstract. We present a custom acoustic emission (AE) monitoring system designed to perform long-term measurements on high-alpine rock walls. AE monitoring is a common technique for characterizing damage evolution in solid materials. The system is based on a two-channel AE sensor node (AEnode) integrated into a wireless sensor network (WSN) customized for operation in harsh environments. This wireless architecture offers flexibility in the deployment of AE-nodes at any position of the rock wall that needs to be monitored, within a range of a few hundred meters from a core station connected to the internet. The system achieves near real-time data delivery and allows the user to remotely control the AE detection threshold. In order to protect AE sensors and capture acoustic signals from specific depths of the rock wall, a special casing was developed. The monitoring system is completed by two probes that measure rock temperature and liquid water content, both probes being also integrated into the WSN. We report a first deployment of the monitoring system on a rock wall at Jungfraujoch, 3500 m a.s.l., Switzerland. While this first deployment of the monitoring system aims to support fundamental research on processes that damage rock under cold climate, the system could serve a number of other applications, including rock fall hazard surveillance or structural monitoring of concrete structures.

show abstract

Microseismicity of an Unstable Rock Mass: From Field Monitoring to Laboratory Testing

et al. 2018

View full text Add to dashboard Cite

The field‐scale microseismic (MS) activity of an unstable rock mass is known to be an important tool to assess damage and cracking processes eventually leading to macroscopic failures. However, MS‐event rates alone may not be enough for a complete understanding of the trigger mechanisms of mechanical instabilities. Acoustic Emission (AE) techniques at the laboratory scale can be used to provide complementary information. In this study, we report a MS/AE comparison to assess the stability of a granitic rock mass in the northwestern Italian Alps (Madonna del Sasso). An attempt to bridge the gap between the two different scales of observation, and the different site and laboratory conditions, is undertaken to gain insights on the rock mass behavior as a function of external governing factors. Time‐ and frequency‐domain parameters of the MS/AE waveforms are compared and discussed with this aim. At the field scale, special attention is devoted to the correlation of the MS‐event rate with meteorological parameters (air temperature and rainfalls). At the laboratory scale, AE rates, waveforms, and spectral content, recorded under controlled temperature and fluid conditions, are analyzed in order to better constrain the physical mechanisms responsible for the observed field patterns. The factors potentially governing the mechanical instability at the site were retrieved from the integration of the results. Abrupt thermal variations were identified as the main cause of the site microsesimicity, without highlighting irreversible acceleration in the MS‐event rate potentially anticipating the rock mass collapse.

show abstract

Acoustic Emission/Microseismic Source Location in Geotechnical Applications

Cited by 15 publications

References 3 publications

Microseismic activity analysis for the study of the rupture mechanisms in unstable rock masses

Microseismic activity analysis for the study of the rupture mechanisms in unstable rock masses

A custom acoustic emission monitoring system for harsh environments: application to freezing-induced damage in alpine rock walls

Microseismicity of an Unstable Rock Mass: From Field Monitoring to Laboratory Testing

Contact Info

Product

Resources

About