| 摘要 |
A hard compact material, such as rock, is broken by forcing a longish mass body of relatively incompressible fluid, such as water, against the material to be broken. The mass body is directed into a hole in the material for impacting a surface therein. Prior to the impact delivering the mass body is accelerated to an impact velocity of sufficient magnitude for causing cracks to form in the material. Further, cracks in the hole are propagated toward a free surface in the material by the effect of the momentum or kinetic energy of the mass body. |
