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Keywords: standard penetration rate
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Proceedings Papers
Paper presented at the 6th ISRM Congress, August 30–September 3, 1987
Paper Number: ISRM-6CONGRESS-1987-109
...: – "a" is the projected area – "h" is the penetration – "1" is the length of the cutting edge – " " is the wedge angle of the cutting tool, which is approximately the same for all bits. drilling fluids and materials laboratory test standard penetration rate percussive drilling penetration rate...
