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The wave pattern will then reflect from the crack in the bottom of the hole in the form of tension, creating a wave structure to combat the need for sub-grade drilling.
When the hole is initiated, a pressure pulse will be directed into the air or...
The combination of the two will cause a horizontal crack or pre-split effect...
The wave pattern will then reflect from the crack in the bottom of the hole...
This final image shows shock wave interaction (wave interaction among...