Demolition performance of high-pressure water jet based on SPH coupling with FEM for hydraulic demolition robot

Due to the huge computational cost caused by using multi-layer particles to achieve continuous water jet, this work developed a numerical model adopting single-layer particles to realize the unrestricted long-time continuous water jet. Then the demolition performance of continuous water jet was analyzed and the rock failure mechanism was illustrated based the developed model, providing a reference for hydraulic demolition application. Furthermore, the influence of water jet velocity, transverse velocity, target distance, abrasive mass percentages and water jet spacing on the demolition performance was obtained. The results show that the developed model can greatly promote the calculation efficiency. The demolition width of continuous water jet is more sensitive to water jet velocity. Compared with target distance, transverse velocity and water jet velocity have more significant effects on demolition depth. In addition, the demolition width and depth can be significantly increased by abrasive water jet. Setting the water jet spacing around 2.2 times the jet diameter to arrange high-pressure water jets is more reasonable according to the applicable requirements in demolition robot.