Review of Effects of Hypervelocity Jets and Projectiles on Rock

摘要

New methods are being continuously sought which will radically increase the rates of tunnel excavation. Attention has turned to the use of hypervelocity impact as a means of cutting and breaking rock, as well as the use of lasers, electric current, explosive drilling, high frequency vibration, etc. The information in this report was assembled and analyzed to give a state of the art summary of hypervelocity techniques which show promise for use in cutting and breaking rock. These include the use of water jets, metallic jets and hypervelocity projectiles. (Author)