Experimental Study on Directional Fracture Blasting of Cutting Seam Cartridge

Yang, Renshu; Zuo, Jinjing

doi:10.1155/2019/1085921

Cited by 11 publications

(7 citation statements)

References 20 publications

(20 reference statements)

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“…Figure 7 extracted the initial peak pressure of 10 measuring points at the blasthole axis under E 0 working condition. The initial shock wave decreases in the form of power function when it is transferred in the rock mass, which is following the law of pressure attenuation in the blasting of cutting seam cartridge [44].…”

Section: Direction Of Blasthole Axismentioning

confidence: 97%

Study on Eccentric Uncoupled Blasting Effect of Cutting Seam Pipe

2021

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In order to study the blasting effect and the damage to the rock mass when the cutting seam cartridge is eccentrically and uncoupled. The ANSYS/LS-DYNA® nonlinear dynamic platform was used to simulate the blasting effect of five eccentric uncoupled coefficients on the cutting seam cartridge, and the crack growth process under the condition of complete eccentricity was simulated. By comparing and analyzing the stress of measuring points in the direction of cutting seam, vertical cutting seam direction, and circumferential cutting seam pipe under different working conditions. It is concluded that the effect of detonation products is affected by the wrapping property of the cutting seam pipe and the eccentric uncoupled coefficient. With the increase of the eccentric uncoupled coefficient, the load distribution presents obvious non-uniformity. The pressure on the uncoupled side of the blasthole is smaller than that on the coupled side, and the peak time of the uncoupled side also lags behind that on the coupled side. When the eccentric uncoupled coefficient is 1, the peak pressure on the coupled side is 5.78 times that of the uncoupled side, and the explosive stress field is biased toward the coupled side. The existence of the cutting seam pipe causes stress concentration at the opening, which enhances the guiding effect of the initial crack, and the stress in the non-cutting seam direction is buffered. Therefore, the eccentric arrangement of the cutting seam pipe determines the formation of the initial crack and the subsequent blasting effect. When the cutting seam cartridge is arranged eccentrically and uncoupled, it will cause under-excavation at the connection direction of blasthole, which will cause less disturbance to the rock mass on the uncoupled side. If the retaining side rock mass is on the coupled side in actual blasting, the eccentric uncoupled arrangement will cause greater over-excavation and damage. Therefore, it is necessary to avoid this situation as far as possible and provide better guidance for the actual construction.

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Section: Direction Of Blasthole Axismentioning

confidence: 97%

Study on Eccentric Uncoupled Blasting Effect of Cutting Seam Pipe

2021

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“…Te caustic specks at the crack tip can be observed in the dynamic caustic experiment system, and the crack propagation velocity and stress intensity factor can be calculated [5,6]. Yang et al [7,8] studied the directional crack characteristics of a cutting seam cartridge, and the transmission mechanism of the explosion wave of the cutting seam cartridge with diferent uncoupling coefcients. Yue et al [9][10][11] analysed the interaction between cracks for a double-hole directional crack-controlled explosive using the caustic method, also studied the application of the cutting seam cartridge.…”

Section: Introductionmentioning

confidence: 99%

“…Te high-speed schlieren experiment system can monitor the density change of the air feld under disturbance [16,17]. Yang et al [18,19] adopted this device and studied the evolution of an explosive wave feld in an exposed air medium. Zuo et al [20] studied the explosion wave propagation characteristics of cylindrical explosive at diferent initiation positions, and obtained the included angle range of explosion shock wave incident on the hole wall, revealed the distribution characteristics of explosion cracks in diferent areas.…”

Section: Introductionmentioning

confidence: 99%

Propagation Characteristics of Explosion Wave and Explosion Gas in Blast-Hole

Zuo

Xie

2023

Shock and Vibration

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In order to explore the propagation characteristics of explosion wave and gas in blast-hole, design a model to simulate blast-hole charge in the laboratory, adopted a high-speed schlieren experiment system used to study the evolution characteristics of explosion wave field under two kinds of charge structures. The results showed similar explosion wave velocities for the two cartridges, the explosion wave was reflected when it reaches the hole wall, and the reflected wave velocity was lower than an incident wave. The explosion gas tends to cluster and spread in a cutting direction, resulting in intensified destruction in that direction. The explosion wave first emerges in the direction of the slits, and then moves towards the blast-hole walls, which indicates that the explosion energy can be accumulated in the slit direction and cause directional destruction of the medium. To study this process in detail, establish numerical model for the propagation of explosive in the hole. The results indicated that the detonation products first come out in the direction of the slits and then go around towards other areas in a distribution that is consistent with the observations by high-speed schlieren photography.

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“…Using schlieren method, Gao [21] studied the propagation process of shock waves and blast-induced products from a slit charge holder. In addition, by schlieren method and numerical simulation, Yang and Zuo [22] also studied the directional fracture mechanism of slit charge blasting. ese blast experiments using schlieren method verify that this optical method is a useful approach to study shock waves and blast products near the borehole.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Shock Wave Propagation of the Explosion in a Pipe with Holes by High-Speed Schlieren Method

Zhang

2020

Shock and Vibration

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The shock wave propagation of the explosion in a pipe with holes was studied by a high-speed schlieren experimental system. In the experiments, schlieren images in the explosion were recorded by a high-speed camera from parallel and perpendicular orientations, respectively, and the pressure in the air was measured by an overpressure test system. In parallel orientation, it is observed that the steel pipe blocks the propagation of blast gases, but it allows the propagation of shock waves with a symmetrical shape. In perpendicular orientation, oblique shock wave fronts were observed, indicating the propagation of explosion detonation along the charge. Shock wave velocity in the hole direction is larger than that in the nonhole direction, indicating the function of holes in controlling blast energy, that is, leading blast energy to hole direction. Furthermore, the function of holes is verified by overpressure measurements in which peak overpressure in the hole direction is 0.87 KPa, 2.8 times larger than that in the nonhole direction. Finally, the variation of pressure around the explosion in a pipe with holes was analyzed by numerical simulation, qualitatively agreeing with high-speed schlieren experiments.

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Experimental Study on Directional Fracture Blasting of Cutting Seam Cartridge

Cited by 11 publications

References 20 publications

Study on Eccentric Uncoupled Blasting Effect of Cutting Seam Pipe

Study on Eccentric Uncoupled Blasting Effect of Cutting Seam Pipe

Propagation Characteristics of Explosion Wave and Explosion Gas in Blast-Hole

Experimental Study on Shock Wave Propagation of the Explosion in a Pipe with Holes by High-Speed Schlieren Method

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