Investigation on Large-Scale Tests of Rock Fracturing by High-Voltage Electric Pulse with Voltage as a Variable

Abstract

In this paper, we use an independently developed high-voltage electrical pulse (HVEP) system to implement fracturing of solid rocks. The discharge capacitance was 150 μF, and the voltage was increased from 8 to 14 kV to increase the discharge energy. The rock appears cracked at 14 kV and 150 μF. The parameters current, strain, and vibration are utilized to investigate the rock-breaking pattern of HVEP. An increase in voltage can generate a heightened destructive effect. The enhanced effects are reflected in the peaks of current, strain, and vibration. Cracks result in an acceleration of the rate of decay of the vibration curve. Also, the rate of variation of the peak strain raises. According to the spectrum analysis, HVEPs primarily generate low-frequency energy to crack rocks in the 0 to 2000 Hz range.