Controlled blasting in an open-pit mine for improved slope stability

Singh, Virendra; Singh, Divya

doi:10.1007/bf00600523

Cited by 14 publications

(15 citation statements)

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“…Blasting technology with directional control for a cutting seam cartridge is widely and effectively applied in engineering fields like deep rock projects, tunnel excavation, slope excavation, and precious stone mining [1][2][3]. A cutting seam cartridge is the placement of an explosive in a tube shell with a certain strength and with kerf seams on both sides of the shell, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Directional Fracture Blasting of Cutting Seam Cartridge

Yang

Zuo

2019

Shock and Vibration

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Since the cutting seam cartridge has sound directional breaking effect, in order to explore its blasting wave mechanism, an experimental study was conducted on the blast wave of a cutting seam cartridge using a high-speed laser schlieren system and air overpressure test system. The research results show that during cartridge explosion, the cutting seam pipe can effectively control the energy release and detonation gas dynamic behaviors. Additionally, the cartridge blast wave and the detonation gas remain highly symmetrical in expansion form. The blast wave first propagates along the cutting seam direction, and the detonation gas initially expands from the seam in the direction of the cutting seam. The pressure in the cutting seam direction is higher than that in the noncutting seam direction. The blast wave change of the whole flow field of the cutting seam cartridge was numerically simulated and was basically consistent with the results of the schlieren test in distribution form. The presence of a cutting seam prolongs the blast wave effect. During expansion of the cutting seam pipe under the influence of a blast wave, the inner wall of the cutting seam pipe is mainly subject to tensile stress. When the tensile force applied to the inner wall reaches the local yield limit, the cutting seam pipe fails.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Directional Fracture Blasting of Cutting Seam Cartridge

Yang

Zuo

2019

Shock and Vibration

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“…The overexcavation has a serious negative effects on the structural stability of the rock mass around the cavern [1,2]. Besides, the overexcavation of road tunnel will inevitably affect the field construction of tunnel project [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…Since the diameter of stick dynamite is generally smaller than that of the blast-hole, stick dynamite will be eccentric to the hole as the gravity force. The eccentric decoupled charge structure is formed then [1][2][3]. Wei [10] analyzed the eccentric decouple charge structure theoretically and considered that the crack is firstly produced at the contact point between the explosive and hole wall, and then it played an inhibitory role in the initiation of other points.…”

Section: Introductionmentioning

confidence: 99%

Calculation Model and Decoupling Coefficient Sensitivity Study of Periphery Hole for Eccentric Decoupled Charge in Highway Tunnels

Wang

Liu

2018

Shock and Vibration

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On the basis of the eccentric decoupled charge form on site and borehole concentric decoupled computational theory, the calculation model of eccentric decoupling charge would be established in the present study. The calculation model takes into account the influence factors such as damage to the surrounding rock, air, and water decoupled media. Besides, based on the proposed calculation model, blasting effect of a small-diameter EJ-102 emulsion explosive is calculated by using ANSYS LS-DYNA. The influence of decoupling coefficient, different rock grade, and different RQD value on blasting effect is obtained by sensitivity analysis of the simulated parameters. Then the calculated results are compared with the empirical results. The blasting parameters of fractured rock mass are also optimized by numerical simulation.

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“…In the rapid excavation construction of coal mine shaft and drift, the blasting of peripheral boreholes has aroused an extensive attention, and the long‐term engineering practices show that peripheral borehole has a significant impact on formation quality of drift in smooth blasting. Traditional directed fracture controlled blasting uses slot blasting to control the direction of explosive energy release, enables the prioritized energy release along the direction of drift contours, forms the guiding cracks, inhibits the crack propagation in the nonslot direction, ensures the formation quality of periphery, and reduces the back break . The macroscopic dynamic characteristics of crack propagation include crack length, deflection angle, propagation velocity, acceleration, dynamic stress intensity factor (DSIF) and dynamic energy release rate.…”

Section: Introductionmentioning

confidence: 99%

“…Traditional directed fracture controlled blasting uses slot blasting to control the direction of explosive energy release, enables the prioritized energy release along the direction of drift contours, forms the guiding cracks, inhibits the crack propagation in the nonslot direction, ensures the formation quality of periphery, and reduces the back break. 1 The macroscopic dynamic characteristics of crack propagation include crack length, deflection angle, propagation velocity, acceleration, dynamic stress intensity factor (DSIF) and…”

Section: Introductionmentioning

confidence: 99%

Analysis of dynamic characteristics of through‐wall cracks between 2 boreholes in the directed fracture controlled blasting

Wang

2017

Fatigue Fract Eng Mat Struct

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Through‐wall cracks between 2 boreholes in the directed fracture controlled blasting have been always concerned by researchers. Dynamic characteristics of through‐wall cracks between 2 boreholes and lateral crack propagation of boreholes in the double‐borehole slot mode and the synchronous blasting of boreholes were examined using the explosive loading digital dynamic caustics experiment system. And the effects of borehole loading mode and borehole clearance on through‐wall cracks between boreholes were examined using distinct lattice spring model numerical analysis, based on the experiment model. Findings show that the tips of through‐wall cracks between boreholes did not meet directly but staggered, continuously propagated after meeting, and moved closer to the existing anisotropic crack direction. The velocity and acceleration of crack propagation fluctuated. KI rapidly decreased from the maximum value, then gradually increased after a repeated volatility, and began to decrease after it reached the second peak. During the process of crack propagation, KII was basically smaller than KI. The dynamic energy release rate rapidly decreased from the maximum value, reached the second peak after the volatility, and gradually decreased again. The borehole loading mode and borehole clearance had significant effects on through‐wall cracks between boreholes.

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Controlled blasting in an open-pit mine for improved slope stability

Cited by 14 publications

References 0 publications

Experimental Study on Directional Fracture Blasting of Cutting Seam Cartridge

Experimental Study on Directional Fracture Blasting of Cutting Seam Cartridge

Calculation Model and Decoupling Coefficient Sensitivity Study of Periphery Hole for Eccentric Decoupled Charge in Highway Tunnels

Analysis of dynamic characteristics of through‐wall cracks between 2 boreholes in the directed fracture controlled blasting

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