The exploitation of deep resources and energy needs to break hard rock. Aiming at the problem rock fragmentation, this paper proposes a variable cross-section squeezing pulsed water jet technology (SPWJ). SPWJ was generated under pump pressures 5.2, 6.8, 8.5, 10, 11.9, 13.8 MPa carry out erosion experiments. Features such as spalling area, depth, volume loss, decomposition per unit inlet pressu...