Fig. 1. Schematic of experimental platform for electrohydraulic disintegration of rocks（EHDR）

Fig. 2. Image of the discharge plasma channel captured by high speed camera and the schematic of cylindrical expansion model

Fig. 3. Schematic of equivalent circuit for EHDR

Fig. 4. Typical process of underwater high voltage pulsed discharge

Fig. 5. Measured and simulated shockwave pressure (U_C＝15 kV, l＝10 mm)

Fig. 6. Simulation results of plasma channel resistance and energy characteristic under different charge voltage

Fig. 7. Variation trend of average plasma channel resistance (R_ch), deposited energy (E_ch), shockwave energy (E_sw) and energy efficiency (η_sw) under different charge voltage

Fig. 8. Simulated waveforms of shockwave under different charge voltage and variation trend of shockwave characteristics