Shock-induced fracture of dolomite rock in small-scale blast tests

Baranowski, Paweł; Kucewicz, Michał; Pytlik, Mateusz; Małachowski, Jerzy

doi:10.1016/j.jrmge.2021.12.022

Cited by 19 publications

(16 citation statements)

References 41 publications

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“…Small-scale blast experiments were not performed with the investigated sandstone in the present study. Consequently, the numerical simulations of the small-scale blasting test conducted previously 56,87 are described and compared with the analytical solution for calculating the number of radial cracks 88 . The adopted procedures follow a previous study 87 ; therefore, only a brief description of the numerical modeling is provided here.…”

Section: Small-scale Blasting Testmentioning

confidence: 99%

“…Consequently, the numerical simulations of the small-scale blasting test conducted previously 56,87 are described and compared with the analytical solution for calculating the number of radial cracks 88 . The adopted procedures follow a previous study 87 ; therefore, only a brief description of the numerical modeling is provided here. A cylindrical specimen with a height and diameter of 130.0 mm was used in the numerical simulations.…”

Section: Small-scale Blasting Testmentioning

confidence: 99%

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JH-2 constitutive model of sandstone for dynamic problems

Baranowski,

Kucewicz,

Janiszewski

2024

Sci Rep

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This paper demonstrates the application of the Johnson–Holmquist II (JH-2) model with correlated and validated parameters to simulate the behavior of a sandstone. The JH-2 model is used to simulate various tests, including single-element tests, structural quasi-static uniaxial and triaxial compression tests, and the split Hopkinson pressure bar test. Additionally, the model is used to simulate drop-weight impact test using a ball bearing and two loading scenarios involving small-scale blasting and projectile impacts. Quantitative and qualitative comparisons demonstrate that the JH-2 model agrees well with both experimental and analytical results. Limitations of the model are also highlighted, particularly for quasi-static problems, as the model was originally developed for high-strain-rate simulations. Ultimately, this study demonstrates that the JH-2 rock constitutive model can obtain reasonable results for a material other than the material for which the model was originally correlated and validated. This paper provides valuable guidance for modeling and simulating sandstone and other rock materials subjected to dynamic loadings.

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Section: Small-scale Blasting Testmentioning

confidence: 99%

Section: Small-scale Blasting Testmentioning

confidence: 99%

JH-2 constitutive model of sandstone for dynamic problems

Baranowski,

Kucewicz,

Janiszewski

2024

Sci Rep

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“…The comparison shows that the method can improve the efficiency of fracture reproduction. Pawel Baranowski et al [ 23 ] studied the damage of dolomite through small-scale blasting test. The results show that the heterogeneity and initial cracks have significant effects on the observed failure and cracking patterns.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of rock blasting under different in-situ stresses and joint conditions

Rong,

Li,

Cao

et al. 2024

PLoS ONE

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High primary rock stress can limit the generation of rock cracks caused by blasting, and blasting usually shows different rock breaking states under different primary rock stress conditions. There are a large number of naturally formed joints in rock mass, due to the limitations of laboratory tests, a numerical model of jointed rock mass was established using LS-DYNA software to investigate the evolution of blasting damage under various in-situ stresses and open joints. In this simulation, using the Lagrange-Euler (ALE) procedure and the equation of state (JWL) that defines explosive materials, the study considered different joint thicknesses (2cm, 4cm, and 6cm), joint angles (0°, 30°, 60°, and 90°), and in-situ stress conditions (lateral stress coefficients of 0.5, 1, and 2, with vertical in-situ stresses of 10MPa and 20MPa), through stress analysis and damage area comparison, the relationship between damage crack propagation and horizontal and vertical stress difference is explored. The research aimed to understand the mechanisms underlying crack initiation and propagation. The results show that: (1) The presence of joints exerts a barrier effect on the expansion and penetration of cracks. When explosion stress waves reach the joint surface, their propagation is impeded, leading to the diffusion of wing cracks at the joint ends. When the lateral stress coefficient and joint angle are the same, an increase in initial in-situ stress results in a reduction in the area of the blasting damage zone. (2) Under the same initial in-situ stress conditions, the area of the blasting damage zone initially increases and then decreases with an increasing joint angle. However, it remains larger than that without a joint, and there exists an optimal angle that maximizes the damage area. In the simulated conditions, the area of damage cracks is greatest when the joint angle is 60° dip angle. (3) The presence of initial in-situ stress has a certain impact on the initiation and expansion of blasting cracks. The degree and nature of this influence are not solely related to the lateral stress coefficient but also depend on the joint’s angle and thickness. When in-situ stress is present, the initial in-situ stress field’s pressure is not conducive to the initiation and propagation of blasting cracks. However, the existence of a joint has a noticeable guiding and promoting effect on crack propagation, and the pattern of crack propagation is influenced by both joint and in-situ stress conditions.

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“…Under such conditions, lower thermodynamic parameters of bulk emulsions may be expected and their efficiency, expressed as velocity of detonation, may be much lower [19,20]. A very important issue in the field of blasting effectiveness is also detailed identification of the interaction between the explosive and the rock mass, i.e., propagation of blast-induced fractures around the blasthole [21,22]. This should be treated as the first step in the selection of relevant explosives for given geologic and mining conditions.…”

Section: Introductionmentioning

confidence: 99%

Implementation and Verification of Effectiveness of Bulk Emulsion Explosive with Improved Energetic Parameters in an Underground Mine Environment

et al. 2022

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Explosives are commonly used in the mining industry to extract minerals from hard rock deposits. Therefore, an efficient explosive should ensure that the appropriate blast outcome is achieved, taking into account the desired rock-breaking parameters and the costs of drilling and blasting works. Depending on the type of deposit and follow-up processes, a proper blast result may be characterized by fragmentation, muckpile shape, overbreaks, etc. Industry has struggled to respond to the demand for bulk emulsion explosives with improved energetic parameters, having so far been unable to do so safely, effectively, and cost-efficiently. Methods of improving blasting parameters mainly rely on introducing a variety of additives to the emulsion explosive formulation during production, which creates additional hazards at that stage. Alternative, safe methods of achieving an improved energetic performance of emulsion explosives are, therefore, highly desirable. This paper is focused on one such proposed method as a continuation of previous research works and the performance of a novel bulk emulsion formulation under real mining conditions during the firing of mine faces is described. The tests included density measurements over time, measurements of impact and friction sensitivity, measurements of the detonation velocity in blastholes, determination of brisance via Hess test, and analysis of rock fragmentation. Results were compared with those obtained with a commercially available bulk emulsion explosive, highlighting that the performance improvement achieved by the proposed emulsion modification method is not limited to artificial test conditions, but translates well into actual application conditions.

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Shock-induced fracture of dolomite rock in small-scale blast tests

Cited by 19 publications

References 41 publications

JH-2 constitutive model of sandstone for dynamic problems

JH-2 constitutive model of sandstone for dynamic problems

Numerical simulation of rock blasting under different in-situ stresses and joint conditions

Implementation and Verification of Effectiveness of Bulk Emulsion Explosive with Improved Energetic Parameters in an Underground Mine Environment

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