METHOD TO BREAK ROCK HAVING CRYSTALLINE STRUCTURE Russian patent published in 2007 - IPC E21C37/18 

FIELD: mining, particularly for mine excavation, well drilling, ore preparation, in geophysics for deposit exploration and probing.

SUBSTANCE: method involves applying pulsed electromagnetic field and elastic stress waves to rock, wherein rock is simultaneously treated with pulsed magnetic field having induction of 0.25-1.5 T, pulse duration of 100-300 microseconds and 1·10^-2 - 5·10⁸ Hz frequency, and elastic stress wave. As elastic compression stress waves act on rock magnetic field is created by positive current pulse half-waves. As elastic extension stress waves act on rock magnetic field is created by negative current pulse half-waves. As electric rock resistance decreases up to electric resistance of conductive and semiconductive minerals forming said rock electric current is passed through rock along with following magnetic field induction vector change to provide total rock loosening in treated zone. Magnetic field induction vector is directed orthogonally to elastic stress wave propagation and then the cycle is repeated.

EFFECT: increased degree of crystalline rock weakening due to destruction thereof, inter-crystalline bounds weakening along with decreased power inputs and material consumption.

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