Influence of Radial Stress Gradient on Strainbursts: An Experimental Study

Su, Guoshao; Zhai, Shaobin; Jiang, Jingwen; Zhang, Gangliang; Yan, Litan

doi:10.1007/s00603-017-1266-3

Cited by 79 publications

(30 citation statements)

References 56 publications

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“…This result indicates that the rockburst hazard from the double free faces is more likely to be triggered than that of the rock structure with only one free face because the increasing free face decreases the rock strength. The kinetic energy of the ejected fragments from one free face in the previous study of Su et al (2017d) is 0.91 J, which is much less than the result of double free faces in the present study. These statements indicate that the intensity of rockburst from the double free faces is much larger than that of the rock structure with only one free face.…”

Section: Kinetic Energycontrasting

confidence: 77%

“…Compared with the kinetic energy in the double free faces of the tested specimen, the intensity of the rockburst is random on the surface of the specimen. Compared with the self-initiated rockburst from one free face in the previous study of Su et al (2017d), the specimen with one free face which the stress reaches the strength of specimen with double free faces is not subjected to failure. This result indicates that the rockburst hazard from the double free faces is more likely to be triggered than that of the rock structure with only one free face because the increasing free face decreases the rock strength.…”

Section: Kinetic Energymentioning

confidence: 82%

“…Further, we conduct a self-initiated rockburst test with double free faces in the Y-direction. The X-direction stress ( 2 ) is set to 30 MPa at a loading rate of 0.5 MPa/s, according to a previous study by Su et al, (2017aSu et al, ( , 2017bSu et al, ( , 2017cSu et al, ( , 2017d.…”

Section: Test Planmentioning

confidence: 99%

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Experimental study of the dynamically induced rockburst of a rock wall with double free faces

Chen

et al. 2018

International Journal of Damage Mechanics

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Dynamic disturbance is regarded as one of the most significant factors that induce rockburst around the boundary of underground excavation, particularly in high confining pressure conditions. In the present study, three types of dynamic loading tests are conducted to investigate the dynamically triggered rockburst behavior of a rock wall with double free faces. The three types of dynamic loading considered are the large stress single-pulse loading (mild-disturbance), the middle stress low-frequency cyclic loading (modest-disturbance), and the small stress high-frequency cyclic loading (weak-disturbance). The experimental results are analyzed and the damage evolution process during the dynamic disturbances is described. The tests reveal that the failure strain (i.e., the strain at unstable failure) of the dynamically triggered rockburst is greater than that of the self-initiated rockburst. The intensity of rockburst depends not only on the initial static stress level but also on the dynamic disturbance type. The rockburst induced by the mild-disturbance is mainly related to large amounts of disturbance energy imported. The rockburst caused by the modest-disturbance is contributed by the disturbance degradation of ultimate energy-storage capacity of specimen. The rockburst in a weak-disturbance specimen is primarily due to the disturbance aggravation of the damage in specimen and the elastic strain energy release. In particular, the rockburst hazard from the double free faces is more likely to be triggered and its result more serious than that of the rock structure with only one free face because the increasing free face decreases the rock strength. The fragmentation of the dynamically induced rockburst is larger than that of the self-initiated rockburst. With increasing time of dynamic loading, the damage induced by the modest-disturbance and the weak-disturbance first increases continually, subsequently increases steadily, and finally increases drastically. By contrast, the damage of the specimen under the mild-disturbance condition has a linearly increasing trend.

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Section: Kinetic Energycontrasting

confidence: 77%

Section: Kinetic Energymentioning

confidence: 82%

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Experimental study of the dynamically induced rockburst of a rock wall with double free faces

Chen

et al. 2018

International Journal of Damage Mechanics

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“…Souissi et al [36] used numerical simulation analysis to explore the damage zone around the drill bit during the hard-rock drilling process. Zhao et al and Su et al investigated crack propagation in rock specimens containing a drilled hole and subjected to a compressive load [37,38] and explored the way rock strength varied with radial stress using an acoustic emission method. Huang and Yang [39] analyzed the influence of flaw angle and confining pressure on the mechanics properties of rock when subjected to triaxial compression.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock Damage

Liu

Hao

et al. 2020

Shock and Vibration

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Using a self-designed hydraulic impact drilling test-bed and rock core drill, six groups of cylindrical granite specimens (93 mm dia. × 200 mm) containing central axial holes formed either by impact or nonimpact drilling methods were tested in uniaxial compression to failure on an Instron 1346 universal testing machine to investigate their mechanics and damage properties. The longitudinal acoustic wave velocities were measured before testing. The rock specimens were grouped according to the method of drilling the central hole (impact load exerted by different impact power and different frequencies for an approximately identical impact power, or nonimpact drilling). In this study, a statistical constitutive damage model based on Weibull distribution was used to calculate the degree of rock damage after drilling center holes. The experimental curves were measured to analyze the damage evolution process and the radius of rock damage. These indicate that rock damage increased with the increase of impact power and decreased with increasing impact frequency at constant impact power. This was also verified by the measured longitudinal wave velocity in all rock specimens. These results have significance for guiding the design of composite rock drilling tools that are dedicated to improving rock-breaking efficiency.

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“…In order to understand the mechanism of rockburst more deeply, uniaxial experiments [6][7][8], biaxial experiments [9,10], and true-triaxial unloading experiments were carried out [11][12][13][14][15][16][17][18]. True-triaxial unloading tests can simulate the in situ stress level and reproduce rockburst phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Rockburst in Sandstone Containing Elliptic Holes with Varying Axial Ratios

Wang

Liu

et al. 2019

Advances in Materials Science and Engineering

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Rockburst disaster is one of the prominent problems faced by deep underground engineering. In this study, rockburst in four elliptical holes with different axial ratios in sandstone under biaxial loading is studied as an analogue for underground roadways. Video and acoustic emission (AE) equipment is used to monitor the biaxial loading tests. Experimental results indicate that each of the elliptical holes goes through four stages: quiet period, small particle ejection, spalling, and rockburst. The duration of quiet and spalling periods increased with increasing axial ratio of ellipse. The duration of the ejection and rockburst periods remains unchanged. All the four elliptical holes have V-shaped pits after rockburst occurs. The fragments produced during rockburst are divided into coarse, medium, fine, and micro grains. The quantity of coarse and medium grains increases with increasing axial ratio. The mass ratio of coarse and medium grains increases and that of fine and micro grains decreases. The depth, angle, and area of the V-shaped pits decrease with increasing axis ratio. Tensile cracks play an important role in rockburst failure. Tensile cracks are the dominant crack types formed during rockburst and account for over 70% of all cracks in the samples. The number of tensile cracks increased and the number of shear cracks decreased. This paper has some reference value for practical engineering design and prevention of rockburst.

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Influence of Radial Stress Gradient on Strainbursts: An Experimental Study

Cited by 79 publications

References 56 publications

Experimental study of the dynamically induced rockburst of a rock wall with double free faces

Experimental study of the dynamically induced rockburst of a rock wall with double free faces

Theoretical and Experimental Study of the Effects of Impact Drilling Parameters on the Properties of Surrounding Rock Damage

Rockburst in Sandstone Containing Elliptic Holes with Varying Axial Ratios

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