Abstract
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.
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 language | English |
|---|---|
| Title of host publication | Rock and Fracture Mechanics in Rock Engineering and Mining |
| Publisher | IOP Publishing |
| Number of pages | 8 |
| DOIs | |
| Publication status | Published - 2023 |
| Publication type | A4 Article in conference proceedings |
| Event | EUROCK - Helsinki, Finland Duration: 12 Sept 2022 → 15 Sept 2022 |
Publication series
| Name | IOP Conference Series: Earth and Environmental Science |
|---|---|
| Volume | 1124 |
| ISSN (Print) | 1755-1307 |
| ISSN (Electronic) | 1755-1315 |
Conference
| Conference | EUROCK |
|---|---|
| Country/Territory | Finland |
| City | Helsinki |
| Period | 12/09/22 → 15/09/22 |
Publication forum classification
- Publication forum level 0