Laboratory studies of acoustic emission prior to uniaxial compressive rock failure

Rudajev, Vladimı́r; Vilhelm, Jan; Lokajı́ček, T.

doi:10.1016/s1365-1609(99)00126-4

Cited by 87 publications

(39 citation statements)

References 2 publications

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“…Figures 5 and 6 show that AE signals were generated from within the siltstone specimens throughout the entire uniaxial compression process until failure occurred, that the stress-strain relationship curves between the change in AE count rate and specimens were consistent, and that the maximum value of AE count rate was near the peak stress value. The total AE count curves had the same tendency and approximate shape as the stress-strain curves, which indicated that the AE count rate could characterize the compressive failure process of rocks; this finding is similar to that found in previous studies [25,[29][30][31][32].…”

Section: Characteristics Of the Ae Countsupporting

confidence: 88%

Acoustic Emission Characteristics of Compressive Deformation and Failure of Siltstone under Different Water Contents

Chen

Zhao

Zheng

2017

Advances in Materials Science and Engineering

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The uniaxial compression and acoustic emission (AE) monitoring of siltstone specimens in the Gongchangling open-pit iron mine in Liaoning Province was conducted by evaluating the effects of three water saturation levels: dry, natural, and water-saturated. The siltstone AE characteristics were analyzed according to water content; the relationship between the AE characteristics and the growth and expansion of siltstone cracks was subsequently discussed. Research results indicated the following: siltstone specimens had distinctly different mechanical properties and AE characteristics according to water content; as the water content increased the compressive strength and elasticity modulus of specimens decreased. In the compacting phase of specimens under compression, the AE count rate of the water-saturated specimen was relatively small and the events were relatively stable. In the linear-elastic deformation phase, the AE count rate of the dry specimen increased sharply, reaching approximately 400 times/s. In the plastic yield deformation phase, the peak value of the AE count rate of the dry specimen ranged between 955 and 1,068 times/s, whereas that of the water-saturated specimen only attained a range of 635 to 782 times/s. In the failure phase, the time to reach the peak stress value of the dry specimen was increased as compared to that of the AE count rate.

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Section: Characteristics Of the Ae Countsupporting

confidence: 88%

Acoustic Emission Characteristics of Compressive Deformation and Failure of Siltstone under Different Water Contents

Chen

Zhao

Zheng

2017

Advances in Materials Science and Engineering

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“…The rockburst is a class of rock failure where strain energy is suddenly released by an unstable fracture of rock [1][2][3][4]. Typically occurring in deep underground mines, rockburst is a common disaster.…”

Section: Introductionmentioning

confidence: 99%

The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics

Liu

Zhan

Zhang

et al. 2018

Shock and Vibration

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The phenomenon of acoustic emission (AE) is associated with rock failure and rock fracturing. In order to investigate the influence of tectonic stress on rockburst in tunnel, a biaxial loading experiment system was used in this study. The excavation operation is undertaken at the center of samples to monitor the tunnel forming process in situ, and the different horizontal stresses can be studied by using the AE monitoring technique. The dynamical fracturing process of the tunnel model was summarized, and the timing parameters of AE signals in rockburst stages were obtained. The curves of AE energy and cumulative AE energy with time show a "step-like" rising trend before the occurrence of rockburst. The evolution of macro-and mesocracks is captured, and the mechanical conditions for a "V-shaped" rockburst pit are derived. As the horizontal stress increases, the effect of excavation unloading becomes more pronounced, and the damage caused by the rockburst intensifies. In the early stage of rockburst evolution, the fracturing type follows a model of tensile-shear mix model. A positive relationship between the ratio of shear fracturing type and the horizontal stress can be noted when the rock is about to burst, and the high intensity and the high energy released of from the rock-fracturing event have become evident. Thus, the results indicate that one should focus on monitoring both sides of the surrounding rock of the tunnel so as to extract the characteristics of the process of tunnel in tunnel. The applications of biaxial loading system and during an excavation operation provide a useful tool to simulate the rock burst in tunnel at an engineering site.

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“…e peak strength is the macroscopic representation of rock, which cannot reflect internal damage evolution. As an important method in acoustic nondestructive testing, rock internal defects and damage evolution process can be accurately monitored by acoustic emission (AE) detection [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Zhang

2018

Advances in Materials Science and Engineering

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Acoustic emission (AE) signals can be detected from rocks under the effect of temperature and loading, which can be used to reflect rock damage evolution process and predict rock fracture. In this paper, uniaxial compression tests of granite at high temperatures from 25°C to 1000°C were carried out, and AE signals were monitored simultaneously. e results indicated that AE ring count rate shows the law of "interval burst" and "relatively calm," which can be explained from the energy point of view. From 25°C to 1000°C, the rock failure mode changes from single splitting failure to multisplitting failure, and then to incomplete shear failure, ideal shear failure, and double shear failure, until complete integral failure. ermal damage (D T ) defined by the elastic modulus shows logistic increase with the rise of temperature. Mechanical damage (D M ) derived by the AE ring count rate can be divided into initial stage, stable stage, accelerated stage, and destructive stage. Total damage (D) increases with the rise of strain, which is corresponding to the stress-strain curve at various temperatures. Using AE data, we can further analyze the mechanism of deformation and fracture of rock, which helps to gather useful data for predicting rock stability at high temperatures.

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Laboratory studies of acoustic emission prior to uniaxial compressive rock failure

Cited by 87 publications

References 2 publications

Acoustic Emission Characteristics of Compressive Deformation and Failure of Siltstone under Different Water Contents

Acoustic Emission Characteristics of Compressive Deformation and Failure of Siltstone under Different Water Contents

The Mechanical and Fracturing of Rockburst in Tunnel and Its Acoustic Emission Characteristics

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

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