Mechanical and energy dissipation characteristics of granite under cyclic impact loading

Dai, Bing; Shan, Qiwei; Chen, Ying; Luo, Xinyao

doi:10.1007/s11771-022-4897-9

Cited by 21 publications

(5 citation statements)

References 37 publications

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“…e energy gathered at the original tiny defects in the rock stimulates the formation of cracks. [36] Finally, the energy is released during the generation of cracks and fragments, which makes the stress wave energy consumed.…”

Section: Discussionmentioning

confidence: 99%

Damage Evolution of Granite under Ultrasonic Vibration with Different Amplitudes

Han

Zhao

Zhang³

et al. 2022

Shock and Vibration

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As a type of ultra-high frequency loading, ultrasonic vibration is an effective way to break the rock at high rates. Exploring the influence of various factors on the loading effect is essential for its effective application to assist drilling. In this study, the damage evolution of granite under ultrasonic vibration with different amplitudes was investigated. The theoretical and numerical simulation models of rock breaking by ultrasonic vibration were established. The research group applied ultrasonic vibration loading to granite using different amplitudes. The damage characteristics were tested by NMR experiment, and the damage evolution was numerical analyzed by Particle Flow Code software. The result shows that the propagation of cracks is positively correlated with the amplitude of ultrasonic vibration. The increase of amplitude magnifies the generation of transverse cracks, which is conducive to the stripping of rock fragments. A threshold value was found for the amplitude, and fractures show different propagation and expansion characteristics at the higher and lower values. Increasing the amplitude magnifies the stress at the crystal defect and speeds up the crack propagation process. The stress wave generated by ultrasonic vibration inside the rock will attenuate with the increase in depth. Increasing the amplitude value will amplify the stress in the influence area, and decrease the size of the area.

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Section: Discussionmentioning

confidence: 99%

Damage Evolution of Granite under Ultrasonic Vibration with Different Amplitudes

Han

Zhao

Zhang³

et al. 2022

Shock and Vibration

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“…With the development of urbanization, more and more underground works (shopping malls, passages, pipelines, and other underground works) have been developed to supplement the urban land [ 3 , 4 ]. The construction of underground works does not excavate all the rocks, but always leaves some of them as part of the support system of the underground works [ 5 , 6 ]. In addition, both mechanical excavation and blasting excavation are processes that use dynamic loads to destroy the original state of the rock [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Mechanical and Fracture Behavior of Parallel Double Flawed Granite Material under Impact with Digital Image Correlation

Zhang

Chen

et al. 2023

Materials

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During the excavation of underground projects, the rock masses left as the bearing support system are also subjected to dynamic loads from the excavation activities ahead. These rock masses have been damaged and fractured during the initial exposure (dynamic loads) and are subjected to static loads in the subsequent process as the support system. In this study, granite rock samples and specimens with different angles were produced, preloaded with different confining pressure, and under a combination of dynamic and static loading tests using a modified dynamic and static loading system: split Hopkinson pressure bar (SHPB). The peak strain and dynamic modulus of elasticity are weakened by the inclination angle in a similar way to the strength, with the specimens showing an evolutionary pattern from tensile strain to shear damage. The change in the inclination angle of flaws would weaken the dynamic and combined strengths, and a larger inclination flaw results in a significant decrease in its strength. Fractal analysis revealed that the fractural dimension was closely related to the fissure angle and showed a good linear correlation with the strain rate. This study will provide an important security assurance for deep mining.

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“…Song et al [15] discussed the relationship between the dissipated energy and electromagnetic radiation of coal rocks under cyclic loading. Dai et al [16] established a damage criterion based on the energy dissipation obtained from the cyclic impact load test of granite, which could well characterize the relationship between the damage and the number of impacts. Most of the above experimental studies were carried out under uniaxial or conventional triaxial conditions.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Energy Evolution Characteristics of Sandstone under True Triaxial Cyclic Loading

Dong

Fan

et al. 2023

Applied Sciences

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To study the mechanical and energy evolution characteristics of sandstone under true triaxial cyclic loading, a sandstone mechanical test with different intermediate principal stress under true triaxial loading was conducted using the rock true triaxial disturbance unloading test system. The influence of axial load on the deformation, energy evolution, and macroscopic failure characteristics of sandstone under different intermediate principal stress in a true triaxial test was systematically analyzed, and the damage evolution law of sandstone under true triaxial cyclic load was revealed. Results showed that the failure mode of sandstone under true triaxial compression changed from tension–shear composite failure to tension failure. Grading cyclic load σ1 greatly influenced maximum principal strain ε1 and minimum principal strain ε3 but had little influence on intermediate principal strain ε2. Under the same σ2 condition, the input energy and elastic energy in σ1, σ2, and σ3 directions increased nonlinearly. Under different σ2 conditions, the dissipated energy in σ1, σ2, and σ3 directions decreased with the increase in σ2. With the increase in σ2, graded cycles σ1, ε2, and ε3 decreased considerably, and the failure mode changed from tensile failure to shear failure. When the cyclic loading rate increased, the σ1, ε1, ε2, ε3, and volume strain εv of sandstone failure decreased, but the expansion point increased. Under true triaxial grading cyclic loading and unloading, the total dissipated energy of sandstone increased exponentially. The larger σ2 was, the smaller the damage variable was.

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Mechanical and energy dissipation characteristics of granite under cyclic impact loading

Cited by 21 publications

References 37 publications

Damage Evolution of Granite under Ultrasonic Vibration with Different Amplitudes

Damage Evolution of Granite under Ultrasonic Vibration with Different Amplitudes

Experimental Investigation of Mechanical and Fracture Behavior of Parallel Double Flawed Granite Material under Impact with Digital Image Correlation

Mechanical and Energy Evolution Characteristics of Sandstone under True Triaxial Cyclic Loading

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