Analysis of Dynamic Stresses Imposed on Rocks by Water Jet Impact,

摘要

Numerical calculations are presented which describe the fluid dynamics of a water jet impinging normally onto a rock surface. Both compressible (early-time) and incompressible (late-time,low speed) cases are considered. Targets include a rigid flat plate, a rigid plate with a shallow crater,and a deformable elastic--plastic Charcoal Granite surface. Normal stress histories at the interface are presented quantitatively,and an analytic fit is given for the low-speed,rigid flat target case. This fit compares favorably with experimental results.