Multi-borehole electro-blast method for concrete monolith splitting off

Yudin, A. S.; Kuznetsova, N. S.; Лопатин, В. В.; Voitenko, N V

doi:10.1088/1742-6596/552/1/012028

Cited by 7 publications

(6 citation statements)

References 1 publication

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“…All this factors increases the shock-wave dissipation, and therefore the distance from the boreholes to the free surface under splitting off concrete must be less than the same distance under the splitting off rocks, otherwise the main cracks will not occur. First electro-blasting experiment was produced in the boreholes (6) (fig. 1).…”

Section: Resultsmentioning

confidence: 99%

“…The discharge channel initiation can be implemented simultaneously in several boreholes allowing to split off the object in a predefined direction [6]. It should be noted that the phased electro-blasting is required for an effective crack propagation and destruction large objects.…”

Section: Electric-discharge Destruction Principlesmentioning

confidence: 99%

“…It is also essential to begin the destruction near the free surface paralleled to the axis of boreholes. It is well known that the free surface provides a wave interference which in turn creates the tensile stresses inside a solid material [5][6][7]. The coefficient of electrical energy conversion into the shock-wave disturbances is an important characteristic of electro-explosion.…”

Section: Electric-discharge Destruction Principlesmentioning

confidence: 99%

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A phased splitting off from the high-strength concrete by an electro-blasting method

Voitenko¹,

Yudin²

2016

AIP Conference Proceedings

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A phased splitting off from the monolith concrete block via electro-blasting method have been described. The results of experiments using the high-current pulse generator with operating voltage up to 15 kV and maximum stored energy of 126 kJ with initiation of the discharge in two boreholes were presented. The step by step electro-blast were produced simultaneous within boreholes drilled in the cast in the ground concrete monolith. Each subsequent electro-blast was performed in the boreholes pair situated farther from the free surface. Boreholes in each pair were drilled at a distance of 30-40 cm from each other, and of 25 cm apart from line of previous pair. It is shown that the electro-blasts leads to formation of main cracks at the predefined direction via boreholes line as well as main cracks lead to creation of a new free surfacethat help to form the desirable wave interference at the next step of the electro-blast

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Section: Resultsmentioning

confidence: 99%

Section: Electric-discharge Destruction Principlesmentioning

confidence: 99%

Section: Electric-discharge Destruction Principlesmentioning

confidence: 99%

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A phased splitting off from the high-strength concrete by an electro-blasting method

Voitenko¹,

Yudin²

2016

AIP Conference Proceedings

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“…Uenishi [9] found that the fluctuation-based explosives blast analysis method is also applicable to high-voltage pulse blasting, enabling the controlled non-strenuous dynamic crushing of building materials and structures. A.S. Yudin et al [10] conducted a test involving crushing concrete using a metal electric-wire explosion. The energy utilization of simultaneous blasting and hole-by-hole blasting was compared, and a multi-hole pulse-discharge separation method was proposed.…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of the Fracture of Reinforcement Concrete Columns Using High-Voltage Pulse Discharge

Wang,

Sun,

Wang

2023

Buildings

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High-voltage pulse discharge (HVPD) in liquid technology, when applied to the demolition of concrete structures, has the advantages of green environmental protection, saving energy, emission reduction, safety, reliability, etc. However, research on the influence law of various factors on the effect of crushing is still insufficient. Therefore, this manuscript equated the shock load caused by HVPD to the blasting load and introduced a cohesive zone model based on ABAQUS. The whole process of a concrete column being subjected to a shock wave generated by pulse power discharge was simulated and analyzed. To validate the model’s reasonableness, a comparison and analysis were conducted with the results of experimental studies on concrete column fractures caused by HVPD in liquid. The study further investigated the influence of three parameters—one-side longitudinal reinforcement ratio, volume hoop ratio, and concrete grade strength—on the degree of fracture of the concrete column with a single row of holes (i.e., the width of transverse cracks or longitudinal cracks around the drilled holes). The simulation results revealed that the width of transverse cracks decreases significantly with the increase in the one-side longitudinal reinforcement ratio of the column, while the width of longitudinal cracks decreases substantially with the increase in the volume hoop ratio of the column. In addition, the degree of fracture of concrete columns decreases slightly with the increase in the concrete grade strength. Based on the simulation results, the mathematical expressions between the crack widths (transverse crack width and longitudinal crack width) and the key parameters, such as the one-side longitudinal reinforcement ratio of the column, volume hoop ratio of the column, and concrete grade strength, were established, respectively. These expressions facilitate their practical application in engineering practice.

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“…Numerous experiments of electro-discharge fracture of concrete blocks and oversized rocks [9][10][11] as well as analysis of discharge channel expansion in an optically transparent materials [12,13] shows that the expanding plasma channel generates shock-wave disturbances, which due to the divergence transforms into the plastic and elastic waves in the distance of about 1-2 mm from the channel. The resulting fracture pattern is the material crush region in the vicinity of the channel and more extensive fracturing region covered with the radial cracks.…”

Section: Introductionmentioning

confidence: 99%

Application of Electro-Discharge Blasting Technology for Destruction of Oversized Rocks and Rock Massive Splitting off

Voitenko

Yudin

Kuznetsova

2016

KEM

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The investigation of possibilities of the plasma blasting technology is considered. The method is based on the initiation of a pulsed electric discharge inside the solid dielectric material. The expanding plasma channel generates a shock wave which in the vicinity of the channel (1–2 mm) transforms into the elastic wave with an expressed region of tensile tangential stresses that in turn stimulate the radial crack nucleation. The efficiency of solid destruction at shock-wave action strongly depends on the pulse parameters. The high-current pulse must fulfil the requirements to such parameters: the high-rate of rising edge (0.1–10 ms) and pulse duration (≥ 200–300 ms). The experimental results have shown that the optimal ratio of the borehole depth is 0.6–0.7 from the oversize rock height. For splitting rock massive off the borehole depth should be at least 2 and not more than 5 electro-explosive cartridge lengths and distance between the boreholes should be equal to 1–2 of the boreholes depths. On the basis of the experimental results the recommendations for the electro-discharge destruction and splitting off oversized rocks are presented.

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Multi-borehole electro-blast method for concrete monolith splitting off

Cited by 7 publications

References 1 publication

A phased splitting off from the high-strength concrete by an electro-blasting method

A phased splitting off from the high-strength concrete by an electro-blasting method

Simulation Analysis of the Fracture of Reinforcement Concrete Columns Using High-Voltage Pulse Discharge

Application of Electro-Discharge Blasting Technology for Destruction of Oversized Rocks and Rock Massive Splitting off

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