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Characteristics of the erosion strength of crystalline rocks is presented and discussed, which is of fundamental importance for determining the pure water jet drilling performance. A formulation of the erosion strength is presented from the dimensional analysis of a rectangular particle separation from bottom surface, assuming the anisotropy of the microscopic tensile strength of rocks, and the effect of rock stresses originally acting perpendicular to the drilling axis is discussed in consideration of the stress concentration at the bottom surface. The validity of the present formulation is successfully clarified by analyzing the pure water jet drilling experiment of marble and granite under a biaxial compression, together with the effect of the anisotropy of the tensile strength. As concerns to the chipping upon water jet drilling, it is shown that the incidence of chipping upon drilling increases with increasing of the confining pressure.

Erosion Strength of Crystalline Rocks and the Effect of Rock Stresses.