Abstract
A Theory About Cutting Rock With a Water Jet It is commonly accepted that parameters like compressive strength, fracture toughness etc. are relevant parameters controlling the resistance to mechanical destruction of rock. Parameters like these have no explicit relevance, however, in destruction of rock with a continuous high pressure water jet. A theoretical model about cutting slots in rock is discussed. The model aims mainly at a qualitative description and as a consequence of that at finding the relevant rock parameters. A rock is shown to be characterized by its threshold pressure which can be interpreted as a measure of its “microscale” tensile strength and by its erosion resistance which can be interpreted as the square of the slenderness ratio of the pores of the rock divided by the diameter of the grains.
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