Pulsed Electric Breakdown and Destruction of Granite

There are various methods of rock drilling and demolition. Recently, a method utilizing pulsed power technology has appeared. This method is based on the difference of the dynamic breakdown field strength of liquid and solid dielectrics. The applicability of this method was examined using a very har...

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Published inJPN J APPL PHYS PART 1 REGUL PAP SHORT NOTE REV PAP Vol. 38; no. 11R; pp. 6502 - 6505
Main Authors Inoue, Hirotoshi, Lisitsyn, Igor V., Akiyama, Hidenori, Nishizawa, Izumi
Format Journal Article
LanguageEnglish
Published 1999
Subjects
Computerized tomography
Electric breakdown of solids
Electric discharges
Electric potential
Electrodes
X ray analysis
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Summary:There are various methods of rock drilling and demolition. Recently, a method utilizing pulsed power technology has appeared. This method is based on the difference of the dynamic breakdown field strength of liquid and solid dielectrics. The applicability of this method was examined using a very hard rock–granite. The features of the rock destruction have been studied. The X-ray computer tomography was used to confirm the penetration of the electrical discharge into the rock. Well-resolved marks of the electric discharge channel could be observed using this technique. Destruction effectiveness was examined for various experimental conditions. The volume of the rock destroyed in a shot and the energy consumption in the destruction process are dependent on the generator voltage. The distance between electrodes has the optimum value for a given voltage.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.38.6502