System for Rapidly Boring Through Materials
The present invention is a self-contained, high-energy liquid rock-boring system that will bore a small-diameter access hole  several hundred meters through hard granite and other obstacles within minutes of deployment. It employs a land unit  platform subsystem  with an energetic fluid fuel reservoir  and a boring subsystem  having a plurality of pulsejets . Each pulsejet  repeatedly ignites the energetic fluid  causing a plurality of rapidly-expanding gas bubbles  which create and force a plurality liquid slugs  ahead of them rapidly out through a nozzle  causing the slugs  to impact against materials ahead of the nozzles , boring an access hole . The system also employs an umbilical subsystem  connecting the boring  and the platform subsystems . The system can be used to rapidly bore an access hole  to provide air and resources to trapped miners. Alternatively, the system may also be used to bore an access hole  to underground threatening targets to neutralize them.
W. A. Berger et al., "System for Rapidly Boring Through Materials," The Curators of the University of Missouri, Jan 2010.
Mining and Nuclear Engineering
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