Experimental Investigation on the Rock-Breaking Efficiency of High-Pressure Jet Drill Rod Perforation in Sandstone Roof.

ACS Omega · 2026 · PMC13261444 · PMID 42294183

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Thus, the influence of incident angle on sandstone damage follows a clear trend: a steeper incident angle (closer to 90°) reduces shear damage and concentrates impact energy, while a shallower angle (closer to 70°) enhances shear effects and expands the surface damage area. 4.1.6.

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