Failure characteristic and acoustic emission spatio‐temporal evolution of coal under different cyclic loading rates

Liu, Bin; Zhao, Yixin; Hua, Xinzhu; Ling, Chunwei; Wang, Xiaoliang

doi:10.1002/ese3.1436

Cited by 3 publications

(3 citation statements)

References 44 publications

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“…A higher b value will be obtained if most events are small events with less energy, indicating less cracks or cracks growing slowly, whereas a lower b value represents most AE events that are large events with high energy, indicating many cracks or cracks growing fast. A undulate b value meaning unstable cracks expand [6,33], so the b value is related with the damage degree closely.…”

Section: Characteristic Of Acoustic Emission Parameters In Thementioning

confidence: 99%

“…The energy evolution plays an important role in explaining the mechanism of rock engineering disasters. The energy input by the loading machine can transform and release in multiple forms, such as elastic deformation, plastic deformation [6], infrared heat radiation, elastic wave, and electric energy. The initiation and expansion of microcracks will cause energy release in the form of acoustic emission (AE), which has been used for the prediction of quantitative rock damage widely [7].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study of Multiple Physical Parameters Monitoring during Uniaxial Loading Process of Sandstone

Zhao,

Yang,

Shi

2023

Advances in Civil Engineering

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Aiming at the damage evolution and energy release characteristics of sandstone in failure process, uniaxial and cyclic loading experiments were conducted with the average temperature, infrared temperature field, acoustic emission (AE), and displacement field being monitored simultaneously. The results show that in the low stress stage, the initial pores and fissures are compressed and the thermoelastic effect is insignificant. At the same time, the AE events are active, but most of the events are released with low energy. Then, the surface of the specimen shows stratified displacement phenomenon in the vertical direction. In the following stage, the thermoelastic effect is significant, and the average temperature of specimens shows a linear correlation with stress, whereas the AE is relatively inactive, and vertical surface deformation shows further homogenization and saliency. Because of the top and bottom constraints, the horizontal displacement field shows axis symmetrical distribution of double half-ellipse like a drum. During the yielding phase and the rupture moment, the average temperature rises obviously because of the heat from the friction of the rupture surface, and the temperature field also appears the phenomenon of differentiation; in the meantime, a large amount of AE events occur and the proportion of high energy events increases; further, the deformation field is significantly gathered near the ruptured position. Finally, the time sequence of the multiple physical parameters (AE parameters, average temperature, temperature fields, horizontal and vertical displacement fields) is summarized, which can be a reference for the stress state and failure analysis.

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Section: Characteristic Of Acoustic Emission Parameters In Thementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study of Multiple Physical Parameters Monitoring during Uniaxial Loading Process of Sandstone

Zhao,

Yang,

Shi

2023

Advances in Civil Engineering

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“…Wang performed uniaxial cyclic compression tests at different frequencies on coal samples and observed that the elastic modulus of coal exhibited an initial sharp increase followed by a subsequent sharp decrease with increasing number of cyclic loading cycles [5]. Liu investigated the mechanical and failure characteristics of coal subjected to cyclic load under high stress and discovered a positive correlation between compressive strength of specimens and cyclic loading rate, as well as identified tensile failure as the microfailure mechanism during cyclic loading [6]. Vaneghi determined that higher load amplitudes resulted in greater degrees of strength degradation in hard rock, while also observing more localized fractures compared to static loading conditions [7].…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of the Influence of Amplitude on Deformation and Fracture Characteristics of Hard Rock under Ultrasonic Vibration Load

Zhang,

Wang,

Niu

et al. 2023

Processes

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The utilization of auxiliary tools employing ultrasonic high-frequency vibration to enhance rock breaking efficiency holds significant potential for application in underground hard rock excavation engineering. To investigate the failure mechanism of rocks under high frequency ultrasonic vibration load, this study employs particle flow software PFC2D for numerical simulation. By incorporating boundary conditions from actual ultrasonic vibration rock breaking experiments and utilizing a parallel bond model to construct the rock, we analyze the deformation, damage, fracture, and energy evolution process of hard rocks subjected to vibrational loads. The results demonstrate that the maximum displacement in hard rocks increases nearly linearly with vibrations until reaching 5.0199 × 10−3 m, after which it plateaus. Additionally, macroscopic fissures formed during rock failure exhibit an X-shaped pattern. Furthermore, based on our model, we examine the impact of amplitude variation on hard rocks with an equal number of cycles (5,000,000 cycles). Under ultrasonic vibration loads, amplitude influences the total input energy within the rock system. While increasing amplitude does not alter maximum deformation in rocks, it enhances fragmentation degree, fracture degree and energy dissipation coefficient—thereby improving rock breaking efficiency.

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Mechanical Behavior and Acoustic Emission Characteristics of Sandstone Under Different Cyclic Loading and Unloading Disturbance Rates

Wang,

Bin,

Ling

et al. 2024

Energy Science & Engineering

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The frequency of dynamic disasters is escalating in deep coal mining, with an increasing number of disasters induced by the combined static and dynamic loading. To investigate the mechanical behavior of deep sandstone under mining, cyclic disturbance, uniaxial cyclic loading, and unloading tests with equal amplitude were conducted at four different disturbance rates on the basis of static loading. The influence of loading and unloading disturbance rates on mechanical properties, fracture characteristics, acoustic emission (AE) temporal‐spatial evolution, and fractal characteristics of AE spatial distribution were analyzed. The results show that the peak strength of rock samples initially decreases and then increases as the disturbance rate increases. During the cyclic loading and unloading disturbance stage, AE exhibits a significant Kaiser effect under different disturbance rates. The higher the disturbance rate, the greater the number of cycles with high amplitude AE, but fewer high amplitude AE occur during the loading to peak failure stage. The increment of the damage variable is positively correlated with the loading and unloading disturbance rate overall. The AE spatial fractal dimension in rock samples decreases under different loading and unloading disturbance rates, stabilizing at a range of 2.1–2.3. As the loading and unloading disturbance rate increases, the decreasing magnitude in fractal dimension during the cyclic loading and unloading stage first increases and then decreases, with a relatively smaller decrease during the loading to peak failure stage.

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Failure characteristic and acoustic emission spatio‐temporal evolution of coal under different cyclic loading rates

Cited by 3 publications

References 44 publications

Experimental Study of Multiple Physical Parameters Monitoring during Uniaxial Loading Process of Sandstone

Experimental Study of Multiple Physical Parameters Monitoring during Uniaxial Loading Process of Sandstone

Simulation Analysis of the Influence of Amplitude on Deformation and Fracture Characteristics of Hard Rock under Ultrasonic Vibration Load

Mechanical Behavior and Acoustic Emission Characteristics of Sandstone Under Different Cyclic Loading and Unloading Disturbance Rates

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