Characteristics of capillary discharge channel and its effect on concrete splitting-off by electro-blasting method

N. S. Kuznetsova, A. S. Yudin, N. V. Voitenko

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The numerical simulation results on fracture of a concrete block due to dynamic explosive loads applied to the walls of a blast hole are presented. The influence of the pulse shape on the shock-wave dynamics is considered. A comparison of mechanical stresses in direct and reflected pressure waves induced in the concrete block by explosion pulses of various durations and amplitudes shows that the shorter pulses with higher amplitudes and steeper rise times provide a higher blasting efficiency. The wire application for the discharge initiation enables the operating voltage of the generator to decrease, the discharge gap to increase, and hence, the channel energy to lead to the demolition build-up at electro burst. The significant dependence of the stress-wave profile on the pressure pulse wave shape at the borehole wall, which is determined by the rate of electrical energy release in the plasma channel, has been shown. An analysis of the stress-wave dynamics has shown that the rapid power deposition into a plasma channel tends to shift an amplitude of the tangential stresses in a reflected wave to the higher values and to extend the region of tensile tangential stresses initiating the main crack propagation from the borehole walls to a free material surface.

Original languageEnglish
Article number012043
JournalJournal of Physics: Conference Series
Volume830
Issue number1
DOIs
Publication statusPublished - 4 May 2017
Event5th International Congress on Energy Fluxes and Radiation Effects 2016, EFRE 2016 - Tomsk, Russian Federation
Duration: 2 Oct 20167 Oct 2016

Fingerprint

stress waves
boreholes
pulses
pressure pulses
reflected waves
crack propagation
blasts
electric power
elastic waves
explosions
shock waves
bursts
generators
wire
shift
electric potential
profiles
simulation
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

@article{e55a0e7014444de5a6371fbd9bd9d182,
title = "Characteristics of capillary discharge channel and its effect on concrete splitting-off by electro-blasting method",
abstract = "The numerical simulation results on fracture of a concrete block due to dynamic explosive loads applied to the walls of a blast hole are presented. The influence of the pulse shape on the shock-wave dynamics is considered. A comparison of mechanical stresses in direct and reflected pressure waves induced in the concrete block by explosion pulses of various durations and amplitudes shows that the shorter pulses with higher amplitudes and steeper rise times provide a higher blasting efficiency. The wire application for the discharge initiation enables the operating voltage of the generator to decrease, the discharge gap to increase, and hence, the channel energy to lead to the demolition build-up at electro burst. The significant dependence of the stress-wave profile on the pressure pulse wave shape at the borehole wall, which is determined by the rate of electrical energy release in the plasma channel, has been shown. An analysis of the stress-wave dynamics has shown that the rapid power deposition into a plasma channel tends to shift an amplitude of the tangential stresses in a reflected wave to the higher values and to extend the region of tensile tangential stresses initiating the main crack propagation from the borehole walls to a free material surface.",
author = "Kuznetsova, {N. S.} and Yudin, {A. S.} and Voitenko, {N. V.}",
year = "2017",
month = "5",
day = "4",
doi = "10.1088/1742-6596/830/1/012043",
language = "English",
volume = "830",
journal = "Journal of Physics: Conference Series",
issn = "1742-6588",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Characteristics of capillary discharge channel and its effect on concrete splitting-off by electro-blasting method

AU - Kuznetsova, N. S.

AU - Yudin, A. S.

AU - Voitenko, N. V.

PY - 2017/5/4

Y1 - 2017/5/4

N2 - The numerical simulation results on fracture of a concrete block due to dynamic explosive loads applied to the walls of a blast hole are presented. The influence of the pulse shape on the shock-wave dynamics is considered. A comparison of mechanical stresses in direct and reflected pressure waves induced in the concrete block by explosion pulses of various durations and amplitudes shows that the shorter pulses with higher amplitudes and steeper rise times provide a higher blasting efficiency. The wire application for the discharge initiation enables the operating voltage of the generator to decrease, the discharge gap to increase, and hence, the channel energy to lead to the demolition build-up at electro burst. The significant dependence of the stress-wave profile on the pressure pulse wave shape at the borehole wall, which is determined by the rate of electrical energy release in the plasma channel, has been shown. An analysis of the stress-wave dynamics has shown that the rapid power deposition into a plasma channel tends to shift an amplitude of the tangential stresses in a reflected wave to the higher values and to extend the region of tensile tangential stresses initiating the main crack propagation from the borehole walls to a free material surface.

AB - The numerical simulation results on fracture of a concrete block due to dynamic explosive loads applied to the walls of a blast hole are presented. The influence of the pulse shape on the shock-wave dynamics is considered. A comparison of mechanical stresses in direct and reflected pressure waves induced in the concrete block by explosion pulses of various durations and amplitudes shows that the shorter pulses with higher amplitudes and steeper rise times provide a higher blasting efficiency. The wire application for the discharge initiation enables the operating voltage of the generator to decrease, the discharge gap to increase, and hence, the channel energy to lead to the demolition build-up at electro burst. The significant dependence of the stress-wave profile on the pressure pulse wave shape at the borehole wall, which is determined by the rate of electrical energy release in the plasma channel, has been shown. An analysis of the stress-wave dynamics has shown that the rapid power deposition into a plasma channel tends to shift an amplitude of the tangential stresses in a reflected wave to the higher values and to extend the region of tensile tangential stresses initiating the main crack propagation from the borehole walls to a free material surface.

UR - http://www.scopus.com/inward/record.url?scp=85020047676&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85020047676&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/830/1/012043

DO - 10.1088/1742-6596/830/1/012043

M3 - Article

AN - SCOPUS:85020047676

VL - 830

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

IS - 1

M1 - 012043

ER -