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<p>Abrasive water jet (AWJ) technology is a promising method for breaking and cutting hard rocks, where multiple cuts are often required. However, the effects of repeated AWJ cuts on rock properties and the underlying damage mechanisms remain unclear. In this study, granite, marble, and limestone were selected for AWJ cutting experiments, and the effects of repeated cutting times on rock cutting depth and width are analyzed. The shape of the cutting surface after different cutting times was obtained by the 3D scanner. Moreover, the microscopic characteristics of the cutting surface were investigated using polarizing microscopy and scanning electron microscopy. The results showed that the rates of increase in cutting depth and width for the three types of rocks decreased with increasing numbers of passes. Compared to a single cut, after four cuts, passes led to significant increases in cutting depth (i.e., 186.4% for granite, 177.7% for marble, and 140.5% for limestone) and width (44.4%, 50%, and 54.5%, respectively). Multiple passes can significantly reduce the surface roughness, intensify the grinding effect of abrasives, and exacerbate the damage to rocks and minerals. The fracture mode eventually shifted from following the weak path to a path of jet impact. The fracture pattern of cleavage-containing minerals in granite (feldspar) and marble (calcite and dolomite) progressively develops from fractures along the cleavage plane to transgranular fractures along the jet impact path (perforations and erosion holes), accompanied by damage to the surrounding cleavage planes. Perforation (erosion hole) worsens the damage to quartz crystals without cleavage in granite. Fractures along the oolitic edges of limestone led to material removal along the perforation path. The results have important implications for using repeated AWJ cutting to improve the efficiency of hard rock breaking.</p><p><b>Highlights</b><UnorderedList Mark="Bullet"> <ItemContent> <p>The cutting depth and width are both a power function of the number of passes.</p> </ItemContent> <ItemContent> <p>The micro-mechanisms of repeated cutting of different hard rocks are explained.</p> </ItemContent> <ItemContent> <p>The impact path of the abrasive water jet is closely related to the mineral type.</p> </ItemContent> </UnorderedList></p>

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Cutting Efficiency and Microdamage in Hard Rocks Under Repeated Abrasive Water Jet Cutting

  • 期刊论文

  • 发表日期：

    2025年8月1日

查看全文
  • Zhe Zhou,
  • Zhi Yao,
  • Zhaolong Ge,
  • Zhongtan Li,
  • Jianming Shangguan,
  • Yuhuai Cui,
  • Binbin Ge,
  • Qinglin Deng

摘要

Abrasive water jet (AWJ) technology is a promising method for breaking and cutting hard rocks, where multiple cuts are often required. However, the effects of repeated AWJ cuts on rock properties and the underlying damage mechanisms remain unclear. In this study, granite, marble, and limestone were selected for AWJ cutting experiments, and the effects of repeated cutting times on rock cutting depth and width are analyzed. The shape of the cutting surface after different cutting times was obtained by the 3D scanner. Moreover, the microscopic characteristics of the cutting surface were investigated using polarizing microscopy and scanning electron microscopy. The results showed that the rates of increase in cutting depth and width for the three types of rocks decreased with increasing numbers of passes. Compared to a single cut, after four cuts, passes led to significant increases in cutting depth (i.e., 186.4% for granite, 177.7% for marble, and 140.5% for limestone) and width (44.4%, 50%, and 54.5%, respectively). Multiple passes can significantly reduce the surface roughness, intensify the grinding effect of abrasives, and exacerbate the damage to rocks and minerals. The fracture mode eventually shifted from following the weak path to a path of jet impact. The fracture pattern of cleavage-containing minerals in granite (feldspar) and marble (calcite and dolomite) progressively develops from fractures along the cleavage plane to transgranular fractures along the jet impact path (perforations and erosion holes), accompanied by damage to the surrounding cleavage planes. Perforation (erosion hole) worsens the damage to quartz crystals without cleavage in granite. Fractures along the oolitic edges of limestone led to material removal along the perforation path. The results have important implications for using repeated AWJ cutting to improve the efficiency of hard rock breaking.

Highlights

The cutting depth and width are both a power function of the number of passes.

The micro-mechanisms of repeated cutting of different hard rocks are explained.

The impact path of the abrasive water jet is closely related to the mineral type.