Numerical simulation of the effect of empty hole between adjacent blast holes in the perforation process of blasting

Hua-chao, LI; Zhang, Xiantang; Li, Dan; Wu, Liqun; Gao, Wenle; Zhou, Hongmin

doi:10.3233/jifs-179116

Cited by 18 publications

(8 citation statements)

References 10 publications

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“…Formula (7) can be used as the basis for determining the charge hole spacing of emptyhole directional blasting in engineering site. is is different from Li et al' [32] conclusion that the charge hole spacing is 0.4-0.6 m, and the reason is related to the value of rock parameters and the method of meshing in the model. However, all of them can provide certain guidance and reference for site blasting construction and design.…”

Section: Comparison Between the Simulation Results And Thecontrasting

confidence: 72%

Influence of Charge Hole Spacing on the Crack Propagation Behavior under the Effect of Empty‐Hole Directional Blasting

Tian

Dai

et al. 2020

Advances in Civil Engineering

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In order to explore the reasonable spacing of charge holes in empty-hole directional blasting, based on the action mechanism of empty-hole directional blasting, the influence of charge hole spacing on crack propagation is studied, the calculation formula of charge hole spacing is deduced, and the blasting excavation process in Shijiazhuang South Ring Expressway Tunnel is simulated by finite element software. The results show that by setting empty holes on both sides of the charge holes in the peripheral blasting, the guiding cracks can be formed in the connecting direction between the empty hole and the charge hole, the propagation of cracks in other directions can be suppressed, and the spacing of charge holes can be enlarged. Reasonable charge hole spacing is very important to realize the effect of empty-hole directional blasting; the spacing is small, the rock will be overbroken, and the utilization ratio of explosives is reduced; large spacing, the guiding effect of empty holes is weak, and the effective directional cracks cannot be formed. The spacing between charge holes is closely related to the mechanical properties of rock, detonation parameters of explosive, and aperture of the charge hole and empty hole. According to the simulation results of crack propagation in different spacing, the blasting performance is the best when the charge hole spacing is 800–1000 mm, which is completely consistent with the theoretical calculation result of charge hole spacing 948 mm.

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Section: Comparison Between the Simulation Results And Thecontrasting

confidence: 72%

Influence of Charge Hole Spacing on the Crack Propagation Behavior under the Effect of Empty‐Hole Directional Blasting

Tian

Dai

et al. 2020

Advances in Civil Engineering

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“…Tian et al [9] based on the action mechanism of empty hole directional blasting, the influence of charge hole spacing on crack propagation is studied, deduced the calculation formula of charge hole spacing, and carried out numerical simulate of tunnel blasting excavation process. Li et al [10] use ANSYS/LS-DYNA to simulate the process of rock fragmentation of double blast holes blasting with one empty hole at the center position. The rock fragmentation effect by blasting, the propagation of cracks between adjacent blast holes, and the pressure state of the element near the empty hole are analyzed.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hole Arrangement on the Section of Cavity Formed by Cutting Blast

Wang

et al. 2021

Geofluids

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In order to optimize the arrangement of cutting holes in tunnel blast in Dahongshan Copper Mine, theoretical analysis and numerical simulation were combined to preliminarily determine the diameter of the hollow hole and the distance between the charge hole and the hollow hole during cut blast, which was verified through the field blast test. The research results show that with the increase of the hole diameter, the peak compressive stress of rock surrounding the empty hole gradually decreases, and the peak tensile stress gradually increases, which is consistent with the calculation results; when the hole diameter is 10 cm, the two first blast holes are arranged horizontally and 30 cm from the empty hole, two second blast holes are arranged vertically and 40 cm away from the empty hole, and the four third blast holes are arranged at a horizontal distance of 45 cm and a vertical distance of 45 cm from the empty hole; the contour area in numerical simulation is the maximum. The difference in contour area, contour width, and contour and contour height between the measured value and the simulation result is 5.3%, 3.3%, and 3.4%, respectively, indicating that the combination of theoretical calculation and numerical simulation is suitable for prediction of cavity section after blast in tunnel excavation.

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“…Wang 25 used numerical simulation to explore the propagation characteristics of explosive crack under different working conditions. Li 26 used numerical simulation to explore the effect of empty hole between adjacent blast holes in the perforation process of blasting. In order to study the effects of different diameters of empty holes on the blasting effect of first‐ring cut, Zhu 27 used numerical simulation method to carry out a comparative analysis of the cutting scheme of single empty hole under different diameters of empty holes.…”

Section: Introductionmentioning

confidence: 99%

Study on crack propagation of the CO₂ presplitting blasting empty hole effect in coal seam

Pan

Zhang

et al. 2020

Energy Science & Engineering

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More than 95% of the coal seams mined in high gas, and outburst mines belong to low-permeability coal seams in China, and the difficulty of extracting coal seam gas has become a coal seam feature of most coal mines. 1 To improve the gas drainage efficiency and increase the permeability of coal seams, researchers at home and abroad have conducted much research on appropriate technologies for studying these parameters and have achieves some useful results, such as the use of a regional predrilling pump, 2,3 hydraulic fracturing, 4,5 hydraulic flushing, 6,7 and deep hole

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Numerical simulation of the effect of empty hole between adjacent blast holes in the perforation process of blasting

Cited by 18 publications

References 10 publications

Influence of Charge Hole Spacing on the Crack Propagation Behavior under the Effect of Empty‐Hole Directional Blasting

Influence of Charge Hole Spacing on the Crack Propagation Behavior under the Effect of Empty‐Hole Directional Blasting

Influence of Hole Arrangement on the Section of Cavity Formed by Cutting Blast

Study on crack propagation of the CO₂ presplitting blasting empty hole effect in coal seam

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Numerical simulation of the effect of empty hole between adjacent blast holes in the perforation process of blasting

Cited by 18 publications

References 10 publications

Influence of Charge Hole Spacing on the Crack Propagation Behavior under the Effect of Empty‐Hole Directional Blasting

Influence of Charge Hole Spacing on the Crack Propagation Behavior under the Effect of Empty‐Hole Directional Blasting

Influence of Hole Arrangement on the Section of Cavity Formed by Cutting Blast

Study on crack propagation of the CO2 presplitting blasting empty hole effect in coal seam

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Study on crack propagation of the CO₂ presplitting blasting empty hole effect in coal seam