Experimental study on rock-breaking characteristics of advanced premixed abrasive water jet

ABSTRACT

To investigate the rock-breaking characteristics of the advanced premixed abrasive water jet, experiments of abrasive water jet eroding granite were carried out. The micro-failure morphology of erosion pits was observed and analyzed by CT (Computerized Tomography) and SEM (Scanning Electron Microscope). The results show that the difference in erosion effect caused by different rock breaking pressures is due to the difference in impact kinetic energy. The higher the jet pressure, the higher the impact kinetic energy of abrasive particles, and the erosion effect is enhanced. The difference in erosion effect caused by abrasive types is that the harder abrasives produce greater cutting force on the rock and consume less fracture surface energy. The CT scanning results show that the conical crack at the bottom is caused by the stamping action of abrasive particles and expands rapidly under the action of a water wedge, the action of reflective particles makes the erosion holes appear spindle-shaped. The results of SEM show that the sidewalls of the erosion pit are dominated by the cutting and fatigue-crushing effects of reflected abrasives. The bottom of the erosion pit is mainly driven by the punching action of the incident abrasive.

CO EDITOR-IN-CHIEF:

• Hsiau, Shu-San

ASSOCIATE EDITOR:

• Chen, Ping-Hei

KEYWORDS:

• Advanced premixed abrasive water jet
• micro-morphology
• erosion wear
• hard rock breakage
• rock-breaking mechanism

Acknowledgments

This work has been supported by the National Natural Science Foundation of China under Grant No.52174170, Fundamental Research Funding Project of Henan Polytechnic University, China under Grant No.NSFRF220205 and Henan Province Science and Technology Innovation Talent Program, China, under Grant No.21HASTIT009.

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author upon reasonable request.

Additional information

Funding

The work was supported by the Program for Leading Talents in Scientific and Technological Innovation of Henan Province [21HASTIT009]; National Natural Science Foundation of China [52174170]; Basic Research Funds of Henan Polytechnic University [NSFRF220205].