Progressive failure characteristics and energy accumulation of granite with a pre-fabricated fracture during conventional triaxial loading

Luo, Yi; Gong, Haibiao; Xu, Kun; Pei, Chenhao; Wei, Xiaojie; Li, Xinping

doi:10.1016/j.tafmec.2021.103219

Cited by 23 publications

(9 citation statements)

References 25 publications

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Section: Introductionmentioning

confidence: 91%

“…In recent years, AE evolutionary characteristics during rock fracture were found by laboratory experiments. It was found that AE counts correspond well to rock fracture (Yang and Jing, 2011), AE count rate can reflect the activity degree of internal fracture events and cumulative damage degree of rock (Luo et al., 2022). On the eve of rock failure, cumulative AE hits show an exponential increase (Rudajev et al., 2000), low-frequency, high-amplitude AE signals appear (He et al., 2010; Li et al., 2017a), an overall trend of b values decrease (Du et al., 2021), AE hits and AE counts increase significantly (Zhang et al., 2019), and growth rate of dissipated energy of AE an increase (Luo et al., 2022).…”

Section: Introductionmentioning

confidence: 99%

“…It was found that AE counts correspond well to rock fracture (Yang and Jing, 2011), AE count rate can reflect the activity degree of internal fracture events and cumulative damage degree of rock (Luo et al., 2022). On the eve of rock failure, cumulative AE hits show an exponential increase (Rudajev et al., 2000), low-frequency, high-amplitude AE signals appear (He et al., 2010; Li et al., 2017a), an overall trend of b values decrease (Du et al., 2021), AE hits and AE counts increase significantly (Zhang et al., 2019), and growth rate of dissipated energy of AE an increase (Luo et al., 2022). From the above studies, it is a fact that the AE parameters such as counts, hits and the corresponding b value are closely related to the rock fracture process, and the AE precursor information on the eve of rock failure can be used for early warning of rock failure.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on the evolutionary characteristics of acoustic signals produced by granite damage under uniaxial compression

Chen

Sun

et al. 2023

International Journal of Damage Mechanics

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Acoustic signals emitted during rock fracture constitute an important tool for rock damage evaluation. To investigate the evolutionary characteristics of acoustic emission (AE), microseismic (MS), and sound signals produced by hard rock fracture, uniaxial compression tests on granite specimens observed by AE, MS and sound monitoring were carried out. The evolution characteristics of the acoustic signal index, including its waveform, fractal dimension, b value, main frequency, energy proportion of signal frequency bands, and signal activeness, were analysed. The results indicate that there are significant differences in some characteristics of the AE, MS, and sound on the eve of granite failures, such as the waveform amplitude density, the average decline rate of the b value, the distribution of the main frequency, and the evolution of the energy proportion of the advantage frequency band. The three types of acoustic signals can characterize different scales of rock fracture under uniaxial compression. AE is sensitive to small-scale rock fractures, and MS and sound are sensitive to large-scale rock fractures. In addition, a unified damage evolution equation established by acoustic signals is proposed to quantitatively describe the damage process of granite specimens during uniaxial compression tests.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental study on the evolutionary characteristics of acoustic signals produced by granite damage under uniaxial compression

Chen

Sun

et al. 2023

International Journal of Damage Mechanics

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“…Research has also found that the damage energy increases sharply in the final loading stage, further indicating that the stored energy is released in large quantities during the final stage of destruction. The damping energy does not exhibit a significant mutation during the destruction stage, maintaining an upward trend [42,43].…”

Section: Characterization Of Energy Evolutionmentioning

confidence: 99%

Experimental Study on Energy Evolution and Acoustic Emission Characteristics of Fractured Sandstone under Cyclic Loading and Unloading

Xie,

Sun,

Sheng

2024

Applied Sciences

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To investigate the dynamic response of fractured rock under cyclic loading and unloading, a WHY-300/10 microcomputer-controlled electro-hydraulic servo universal testing machine was used to conduct uniaxial cyclic loading and unloading tests. Simultaneously, acoustic emission (AE) and a CCD high-speed camera were employed to monitor the fracturing characteristics of sandstone. The mechanical properties, energy evolution, AE characteristics, and deformation of 45° sandstone were analyzed. The results indicate that as the load cycle level increases, both the elastic modulus and deformation modulus exhibit a “parabolic” increase, with a rapid rise initially and a slower rate of increase later. The damping ratio generally shows a decreasing trend but tends to rise near the peak load. The total energy, elastic energy, dissipated energy, damping energy, and damage energy all follow exponential function increases with the load level. The b-value fluctuates significantly during the stable crack propagation phase, unstable crack propagation phase, and peak phase. When the FR (Felicity ratio > 1), the rock is relatively stable; when the FR (Felicity ratio < 1), the rock gradually extends towards an unstable state. The Felicity ratio can be used as a predictive tool for the precursors of rock failure. Shear fractures dominate during the compaction and peak phases, while tensile fractures dominate during the crack propagation phase, ultimately leading to a failure characterized by tensile fracture. High-speed camera observations revealed that deformation first occurs at the tips of the prefabricated cracks and gradually spreads and deflects toward the ends of the sandstone. This study provides theoretical support for exploring the mechanical behavior and mechanisms of fractured rock under cyclic loading and unloading, and it has significant practical implications.

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“…In essence, the macroscopic instability of rock is the result the initiation, propagation, aggregation and penetration of internal cracks in rock under drive 43 Therefore, it is of great significance to reveal the internal mechanism of rock mass failure from the perspective of energy. 44 In the process of shear loading, the system energy mainly includes input energy, elastic strain energy, kinetic energy (or mechanical energy) and dissipation energy. Among them, the input energy is the work done by the external load on the rock specimen.…”

Section: Energy Field Mechanism Of Particle Flowmentioning

confidence: 99%

Investigations on the macro‐meso mechanical properties and energy dissipation mechanism of granite shear fracture under dynamic disturbance

Wang

Luo

Gong

et al. 2023

Num Anal Meth Geomechanics

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To explore the mechanical characteristics and failure mechanisms of rock shear fracture under dynamic disturbance, the laboratory shear test and numerical simulation based on particle flow code (PFC) were carried out, and the mesoscopic degradation characteristics and energy dissipation mechanisms of rock shear fracture were analyzed. The results show that: (1) The crack initiation stress of rock under the disturbance condition is relatively reduced by 20%–29%, and there is a “shear fracture weakening effect.” The frequent alternating effect of stress concentration and release at the post‐peak failure stage is more obvious. (2) The number of cracks in rock under shear action shows the evolution of “calm → low speed growth → rapid increase → decrease of amplification → stabilization” with the increase of shear displacement. Compared with the conventional shear test, more cracks, and wider debris zones are formed. The number of cracks increases by 53%–106%, and the number of debris increases by 31%–138%. (3) The energy change trend of disturbance shear fracture test is basically consistent with that of conventional shear test. With the increase of normal stress, the input energy, elastic strain energy and dissipation energy of rock failure point show a certain linear growth feature. Compared with the conventional shear test, the input energy and stored strain energy of the failure point in the disturbance shear test are smaller, with relative reduction of 16.5% and 22.1%. Namely, the normal frequent disturbance reduces the energy storage capacity and failure resistance of rock.

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Progressive failure characteristics and energy accumulation of granite with a pre-fabricated fracture during conventional triaxial loading

Cited by 23 publications

References 25 publications

Experimental study on the evolutionary characteristics of acoustic signals produced by granite damage under uniaxial compression

Experimental study on the evolutionary characteristics of acoustic signals produced by granite damage under uniaxial compression

Experimental Study on Energy Evolution and Acoustic Emission Characteristics of Fractured Sandstone under Cyclic Loading and Unloading

Investigations on the macro‐meso mechanical properties and energy dissipation mechanism of granite shear fracture under dynamic disturbance

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