Locating the spatial region of a future fracture nucleation based on analyzing energy distributions of acoustic emission signals

Damaskinskaya, E. E.; Кадомцев, А. Г.

doi:10.1134/s1069351315030027

Cited by 9 publications

(4 citation statements)

References 11 publications

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“…We can think of the rock fracture process as a problem of non-equilibrium phase transition from a stationary to an unstable state, and the point of transition between them is called the critical point [ 42 ]. Acoustic emission information not only reflects the mechanical properties of the rocks but also contains information about the progress of internal damage in the rocks.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…Acoustic emission information not only reflects the mechanical properties of the rocks but also contains information about the progress of internal damage in the rocks. The time instant of the abrupt change in AE events caused by crack propagation and penetration can be considered the critical point of instability of the specimen during the loading process [ 42 , 43 , 44 ]. Among these, the energy of acoustic emission can reflect the energy accumulation and release laws of the sample.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

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Experiment Study on Damage Properties and Acoustic Emission Characteristics of Layered Shale under Uniaxial Compression

et al. 2023

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The gently tilt-layered shale displays anisotropic behavior and includes structural planes that cause the rock to exhibit weakened features. As a result, the load-bearing capacity and failure mechanisms of this type of rock differ significantly from those of other rock types. A series of uniaxial compression tests were performed on shale samples from the Chaoyang Tunnel to investigate damage evolution patterns and typical failure characteristics of gently tilt-layered shale. An acoustic emission testing system was incorporated to analyze the acoustic emission parameters of the shale samples during the loading process. The results indicate that the failure modes of the gently tilt-layered shale are significantly correlated with the structural plane angles and water content. The shale samples gradually transition from tension failure to tension-shear compound failure as the structural plane angles and water content increase, with an increasing level of damage. The maximum values of AE ringing counts and AE energy for shale samples with diverse structural plane angles and water content are reached near the peak stress and serve as precursors to rock failure. The primary factor influencing the failure modes of the rock samples is the structural plane angle. The precise correspondence between the structural plane angle, water content, crack propagation patterns, and failure modes of gently tilted layered shale can be captured by the distribution of the RA-AF values.

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Section: Experimental Results and Analysismentioning

confidence: 99%

Section: Experimental Results and Analysismentioning

confidence: 99%

Experiment Study on Damage Properties and Acoustic Emission Characteristics of Layered Shale under Uniaxial Compression

et al. 2023

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“…As a result, many methods have been developed to eliminate the influence of noise [29,30], including the most important mean of filtering to separate the concrete cracking signals and other signals, with the purpose of achieving some reliable damage index definitions for the evaluation of damage in a structure. Finally, analysis of processed AE signals mainly involves four techniques: time series analysis [31], spectral characteristics analysis [32,33], spatial positioning analysis [34,35], and waveform analysis [36]. Among them, time series analysis mainly involves characteristic values, such as ring-down count, energy, and amplitude.…”

Section: Introductionmentioning

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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“…One of the problems being solved in seismology is the search for macroscopic characteristics that could be used in monitoring seismically active areas in order to predict earthquakes. The phenomena of seismic quiescence 9 and foreshock activity 10 – 12 , variations of geo-acoustic emission 13 and water level in wells 14 , radon anomaly 15 , alterations of velocities of seismic wave propagation 16 – 18 , Q-factor of the medium 19 , physical and chemical properties of fluids 20 , and others were considered as earthquake precursors. Some analogues of the above phenomena are regularly observed in laboratory experiments 7 , 21 – 24 .…”

Section: Introductionmentioning

confidence: 99%

Traces Of Laboratory Earthquake Nucleation In The Spectrum Of Ambient Noise

Kocharyan

Остапчук

Павлов

2018

Sci Rep

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The short-term forecast of earthquakes associated with fault rupture is a challenge in seismology and rock mechanics. The evolution of mechanical characteristics of a local fault segment may be encoded in the ambient noise, thus, converting the ambient noise to an efficient source of information about the fault stress-strain conditions. In laboratory experiments we investigate micro-vibrations of a block-fault system induced by weak external disturbances with the purpose of getting reliable evidence of how the system transits to the metastable state. We show that precursory changes of spectral characteristics of micro-vibrations are observed for the complete spectrum of failure modes. In the course of experiments we systematically change the properties of interface to perform the transition from stick-slip to steady sliding and observe the characteristics of micro-vibrations of the laboratory block-fault system. Detected were systematical alterations of the system natural frequency and those alterations were determined by the evolution of fault stiffness. The detected regularities suggest that the final stage of seismic event preparation can be revealed in analyzing the spectral characteristics of ambient noise. The detection of natural oscillations of a block-fault system can be a new useful tool to monitor active faults in real time.

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Locating the spatial region of a future fracture nucleation based on analyzing energy distributions of acoustic emission signals

Cited by 9 publications

References 11 publications

Experiment Study on Damage Properties and Acoustic Emission Characteristics of Layered Shale under Uniaxial Compression

Experiment Study on Damage Properties and Acoustic Emission Characteristics of Layered Shale under Uniaxial Compression

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

Traces Of Laboratory Earthquake Nucleation In The Spectrum Of Ambient Noise

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