Controlled blasting with ligamented charge holders

Fourney, W.L.; Dally, J. W.; Holloway, D.C.

doi:10.1016/0148-9062(78)90006-2

Cited by 59 publications

(30 citation statements)

References 1 publication

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“…Especially, fracture control in blasting is very important in underground excavation and demolition of concrete structures. As pointed out by Fourney et al (1978), ideal fracture control implies specification of the number of fracture planes, the initiation sites, the direction of fracture propagation and the stress field driving the fracture front. These requirements in fracture control are also important in partial demolition of concrete structures (Lauritzen, 1989).…”

Section: Introductionmentioning

confidence: 99%

Visualization and numerical analysis of stress waves in blasting process

Matsumoto

Nakamura²,

Itoh

2003

J Vis

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Abs ract : Visualization studies were performed both experimentally and theoretically to observe stress wave propagation in a material and its interaction with the free surface of the material in a blasting process. PMMA (polymethyl-methacrylate) plates were used as a transparent material. The stress wave was generated by initiation of an electric detonator. The stress waves in the PMMA specimen with the right-angled corner were observed by means of the shadowgraph system using a Q switched ruby laser as a light source. In addition to the experiment, a numerical analysis using smoothed particle hydrodynamics (SPH) was also carried out to clarify the dynamic behavior of stress waves in the blasting process. Transmittance and reflection of the stress wave at the free surface could be visualized by both the experiment and the numerical analysis.t

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Section: Introductionmentioning

confidence: 99%

Visualization and numerical analysis of stress waves in blasting process

Matsumoto

Nakamura²,

Itoh

2003

J Vis

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“…Thus, the method in [8] drew together the princlpal achievements of methods in [1,7] and at the same time it became free "of their basic disadvantages. Practical possibilities of using this method have been illustrated sufficiently by the example of one of the possible variants of production technology for its realization [9].…”

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confidence: 97%

“…One of the simplest attachments of this type is a rigid tube with longltudlnal cuts inserted into the borenole (Table i, 3a) [7]. In applying a uniformly distributed load to the internal walls of the tube at the borehole wall around the notches tensile stress concentrations arise which lead to the development of radial cracks in intended areas earlier than they devel,op in another place.…”

mentioning

confidence: 99%

Directed fracture of rocks by blasting

Isakov¹

1983

Soviet Mining Science

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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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Controlled blasting with ligamented charge holders

Cited by 59 publications

References 1 publication

Visualization and numerical analysis of stress waves in blasting process

Visualization and numerical analysis of stress waves in blasting process

Directed fracture of rocks by blasting

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

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