Experimental Study on Crack Propagation of Rock by Blasting under Bidirectional Equal Confining Pressure Load

Ge, Jinjin; Xu, Ying; Huang, Wei; Wang, Haibo; Yang, Rongzhou; Zhang, Zhongyi

doi:10.3390/su132112093

Cited by 10 publications

(7 citation statements)

References 28 publications

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“…However, higher confining stresses can inhibit spalling or shedding when the cracks reach the edges, so the rock specimen will retain its original shape and gain more strength to form relatively complex fracture patterns with crushing cracks at the edges. It is notable that only a very small number of inherited cracks will initiate and propagate during fracturing, which is also supported by the observations in past experiments 42 , 43 . However, due to mathematical constraints, our model cannot present the genuine state of real rock failure and may produce some undesirable results.…”

Section: Numerical Simulation and Analysissupporting

confidence: 83%

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Study on crack evolutional behavior of rocks in triaxial compression based on colony growth dynamics model

Deng

et al. 2022

Sci Rep

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The crack propagation behavior of rock during compression involves complex mechanisms. Describing the growth behavior of a large number of cracks with conventional mechanical models is a major challenge. Therefore, in this work, we propose a new method to describe crack growth behavior by considering crack bodies as free voxels that can expand and coalesce within a rock sample according to certain rules. Specifically, we first propose a crack growth model that quantitatively describes the crack growth ratio and crack growth rate, which are integrally related to the loading rate, internal friction angle, cohesion, initial porosity, and confining stress. Second, to avoid the complex analytical process of the traditional mechanical model in solving the propagation directions of multiple cracks, we introduce a method for determining the crack growth directions of shearing failure based on the colony growth assumption. This method defines the crack propagation direction as a synthetic vector of the inertial direction, the attractive direction, the Coulomb direction, and the edge direction. Moreover, a new mathematical description method of fracture energy and plastic energy is proposed to calculate the crack growth at each time step. The simulation results show that our crack growth model for shearing failure agrees well with the experimental results and explains the fracture behavior and transformation law of cracks to some extent.

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Section: Numerical Simulation and Analysissupporting

confidence: 83%

“…This phenomenon is aligned with the findings in Refs. 42 , 43 . The growth rate in our model represents the probability that those fractured voxels can propagate when the initial fracture stress exceeds the cohesion.…”

Section: Numerical Simulation and Analysismentioning

confidence: 99%

Study on crack evolutional behavior of rocks in triaxial compression based on colony growth dynamics model

Deng

et al. 2022

Sci Rep

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“…The in-situ stress constrained on deep rock mass is simulated by using a self-developed device for model test, which has plane stress loading system, data measurement system and high-speed photography system [15]. The device consists of three parts, which are stress loading platform, oil pressure station, high-speed camera suspension, as shown in Fig.…”

Section: Test Devicementioning

confidence: 99%

Test and mechanism analysis for crack propagation by blasting in rock under the condition of unidirectional load

Ge¹,

Xu²

2022

J. vibroeng.

Self Cite

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In deep rock blasting, there are different constraint conditions such as unidirectional loading, bidirectional loading and tridirectional loading due to in-situ stress. The similar model test of rock blasting under unidirectional load was carry out to study the law of crack propagation in rock by blasting in this study. A transparent material which conformed to the mechanical properties of hard rock is used to make specimens. A high-speed camera was used in some model blasts. After blasting the surface cracks on the specimen were measured, including the near zone and middle zone of blasting. The results showed that: (1) the radial main cracks in the specimens under initial static load propagated along the principal stress direction, which is different from that without initial stress, and there is almost no radial main crack in the direction perpendicular to the principal stress. (2) The average length of radial crack and diameter of circumferential fracture circle gradually decrease with the increase of unidirectional initial stress, but the diameter of compression crushing circle increase. (3) The maximum and average initial velocity of radial crack growth decrease with the increase of unidirectional initial stress.

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“…Hence, it is possible to obtain the rock’s mechanical, deformational, AE, failure, and energy properties, and so on. In addition, the effects of different crack combinations, water, heat, chemistry, and other environments on it are studied, and many useful results are obtained [ 23 , 24 , 25 , 26 , 27 , 28 , 29 ]. However, most of the defects in these studies are concentrated in the middle of the rock specimen or symmetrically distributed in the middle of the rock, and there are also a few studies on the distribution of shear cracks and tensile cracks in rock failure.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Microcrack Evolution Characteristics of Roof Rock of Coal Seam with Different Angle of Defects Based on Particle Flow Code

et al. 2023

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The creation of the natural ceiling rock of the coal seam is rife with fractures, holes, and other flaws. The angle of the defects has a significant influence on the mechanical characteristics and crack evolution of coal seam roof rock. Multi-scale numerical simulation software PFC2D gets adapted to realize the crack propagation and coalescence process in the roof rock of a coal seam with different angles of defects under uniaxial compression. The effect of flaw angles on the micro and macro mechanical characteristics of rock is also discovered. The results show that: (1) the defect angle has influence on the stress-strain, elastic modulus, peak strength, peak strain, acoustic emission (AE) and strain energy of roof rock of coal seam. When the defect angles are different, the starting position of the roof rock in a coal seam fracture is different. The quantity of microcracks firstly reduces with an increase in defect angles before gradually increasing. At the same fault angle, the cracks are mostly tensile ones and only a few shear ones. (2) When the defect angle is less than 90°, tensile and shear fractures are mostly localized at the defect’s two tips and propagate along the loading direction. When the defect angle is 90°, the tensile and shear cracks are not concentrated at the tip of the defect. (3) As the defect angles increase, the elastic strain energy rises initially and then falls, and the dissipated energy and total input energy both increase continuously. The elastic strain energy is greatest at the highest strength. The study provides a certain reference for the use of various analysis methods in practical engineering to evaluate the safety and stability of rock samples with pre-existing defects.

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Experimental Study on Crack Propagation of Rock by Blasting under Bidirectional Equal Confining Pressure Load

Cited by 10 publications

References 28 publications

Study on crack evolutional behavior of rocks in triaxial compression based on colony growth dynamics model

Study on crack evolutional behavior of rocks in triaxial compression based on colony growth dynamics model

Test and mechanism analysis for crack propagation by blasting in rock under the condition of unidirectional load

Mechanical and Microcrack Evolution Characteristics of Roof Rock of Coal Seam with Different Angle of Defects Based on Particle Flow Code

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