Three dimensional numerical rock damage analysis under blasting load

Yılmaz, Özgür; Unlu, Tugrul

doi:10.1016/j.tust.2013.07.007

Cited by 205 publications

(63 citation statements)

References 41 publications

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“…When static compressive stress was perpendicular to the propagation direction, the propagation was then repressed. Considering the influence of initial stress field in deep rock mass on rock failure mechanism, Yilmaz et al [12] used the numerical simulation method to investigate the influencing laws of anisotropic initial static stress field on blasting effect and destruction area. In engineering practices, Kwon et al [13] pointed out in the blasting construction of deep-buried tunnel the importance of understanding and evaluating the influence of deep initial stress field on blasting excavation behavior.…”

Section: State Of the Artmentioning

confidence: 99%

Experimental Study of the Dynamic Mechanical Behavior of Blast-Induced Cracks in Tensile Stress Field

Huang¹,

Ding²,

Xie³

et al. 2020

JESTR

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The propagation behavior of blasting-induced cracks directly determines rock fragmentation and blasting effect. None of existing engineering blasting parameter design has considered the influence of initial tensile stress field on the propagation behavior of blast-induced cracks with a lack of theoretical and experimental guidance; therefore, the rock blasting effect in tensile stress field is far from ideal. The stress distribution and crack stress state around borehole under the coupling action of static tensile stress and blasting stress were determined based on the theory of elastic mechanics to reveal the propagation behavior of blast-induced cracks in the initial tensile stress field and the blasting fracture mechanism. Caustic method and digital laser dynamic caustic experimental system were combined to investigate and analyze laws influencing initial tensile stress and pre-crack angle on dynamic mechanical behavior, such as propagation velocity and dynamic stress intensity factor of blast-induced cracks in the tensile stress field. Results show that under the initial tensile stress field, the stress state of borehole wall in the direction of the vertical stress field is mainly circumferential tensile stress. Blast-induced cracks can easily experience crack initiation in this direction to form better crushing effect. The tensile stress field exhibits an inhibitory effect on the propagation of blast-induced cracks parallel to the direction of tensile stress while having a facilitating effect on the propagation of blast-induced cracks perpendicular to the direction of tensile stress. As the tensile stress field is enlarged, the propagation velocity, dynamic stress intensity factor, and propagation length of blast-induced cracks perpendicular to the direction of tensile stress can also increase. Furthermore, the enlarging pre-crack angle in the tensile stress field can postpone the attenuation of dynamic stress intensity factor and propagation velocity of blast-induced cracks and enlarge their attenuation amplitudes. This study can provide a theoretical guidance for engineering blasting practice in tensile stress field.

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Section: State Of the Artmentioning

confidence: 99%

Experimental Study of the Dynamic Mechanical Behavior of Blast-Induced Cracks in Tensile Stress Field

Huang¹,

Ding²,

Xie³

et al. 2020

JESTR

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“…According to the relevant literature [25][26][27][28], the damage degree D of the similar uranium samples for the experiment was calculated using the following equation: By analyzing the curve of sample 1 and sample 2 in the above images, we can see that the fitting curves of sample 1 (0.07602 Bq·m −2 ·s −1 , 0.04523 Bq·m −2 ·s −1 ) and sample 2 (0.07650 Bq·m −2 ·s −1 , 0.04749 Bq·m −2 ·s −1 ) converge in the 20 Hz test group under the single-sided and double-sided testing conditions. The radon exhalation rate of sample 1 was larger than that of sample 2 with the increase in the vibration frequency.…”

Section: Damage Degree and Porositymentioning

confidence: 99%

“…According to the relevant literature [25][26][27][28], the damage degree D of the similar uranium samples for the experiment was calculated using the following equation:…”

Section: Damage Degree and Porositymentioning

confidence: 99%

Laboratory Experimental Laws for the Radon Exhalation of Similar Uranium Samples with Low-Frequency Vibrations

Cai

Lei

et al. 2018

Sustainability

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Abstract:It is the fact that there are lots of hazard incidents in underground uranium mines caused by radon but in-suit uranium samples were difficult to collect. Based on closed chamber method, three similar samples in different sealed ways were made in a laboratory with different material rations, namely uranium tailings, quartz sand, cement, iron powder and silicon powder to measure the radon concentrations with and without low-frequency vibrations, which was used by the experimental device for low-frequency vibration diffusion of radon. The results showed that the radon exhalation coming from the similar samples was influenced by the low frequency vibration; the results are presented as two-stage variations compared with the blank group. The radon exhalation increased with the rising vibration frequency when the frequency was 50 to 70 Hz, but fell slowly after reaching the peak radon exhalation rate. Analyses of the relations between the rock damage degree, changes in porosity and the occurrence of an inflection point in the radon exhalation rate in the samples found that they also increased when the frequency was between 0 to 80 in sample 3. The maximum porosity of the third samples was about 4.8% with a low-frequency vibration 60 Hz, while the maximum damage degree was about 0.07 at 50 Hz.

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“…The energy release rate is the average value of the 5 excavation steps. Table 2 Radius of crushed area and cracked area around blast holes (Hustrulid, 1999;Iverson et al, 2010;Dai, 2013;Yilmaz and Unlu, 2013;Zhang, 2000;Xu et al, 2002;Xia, 2006 …”

Section: Energy Release Rate (Err) and Numerical Modelmentioning

confidence: 99%

Mitigation of rock burst events by blasting techniques during deep-tunnel excavation

Peng

Zhao

et al. 2015

Engineering Geology

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Three dimensional numerical rock damage analysis under blasting load

Cited by 205 publications

References 41 publications

Experimental Study of the Dynamic Mechanical Behavior of Blast-Induced Cracks in Tensile Stress Field

Experimental Study of the Dynamic Mechanical Behavior of Blast-Induced Cracks in Tensile Stress Field

Laboratory Experimental Laws for the Radon Exhalation of Similar Uranium Samples with Low-Frequency Vibrations

Mitigation of rock burst events by blasting techniques during deep-tunnel excavation

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