Weakening of tensile strength of granitic rock by HV-HF-AC actuation of piezoelectric properties of Quartz: a 3D numerical study

Timo Saksala, Arturo Rubio Ruiz, Pascal-Alexandre Kane, Mikko Hokka

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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High-voltage and high-frequency alternating current (HV-HF-AC) excitation of
piezoelectric properties of Quartz is a potential method to induce cracks in granite. This was recently shown in a numerical feasibility study [6], where cracking was induced on cylindrical rock samples made of granite by sinusoidal AC excitation at the frequency of ~100 kHz and the amplitude of ~10 kV. However, this study did not investigate the weakening effect due to this cracking on the tensile strength of the sample. The present study addresses this topic
numerically. For this end, a numerical method based on 3D embedded discontinuity finite elements for rock fracture and an explicit time stepping scheme to solve the coupled piezoelectro-mechanical problem is adopted. Rock heterogeneity and anisotropy are accounted for at the mineral mesotructure level. A preliminary numerical simulation demonstrates that the HV-HF-AC treatment reduces the tensile strength of a cylindrical granite sample by 12 %,
making it thus a potential non-conventional pre-treatment method in comminution and excavation of Quartz bearing rocks and ores.
Original languageEnglish
Title of host publicationRock and Fracture Mechanics in Rock Engineering and Mining
PublisherIOP Publishing
Number of pages8
Publication statusPublished - 2023
Publication typeA4 Article in conference proceedings
EventEUROCK 2022 - Helsinki, Finland
Duration: 12 Sept 202215 Sept 2022

Publication series

NameIOP Conference Series: Earth and Environmental Science
ISSN (Print)1755-1307
ISSN (Electronic)1755-1315


ConferenceEUROCK 2022
Internet address

Publication forum classification

  • Publication forum level 0


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