FIELD: mining; methods of weakening of rocks and coals. SUBSTANCE: method of weakening of rocks and coals consists in complex and successive injection into rock mass through holes of gaseous and liquid agents. Application of gaseous agents possessing higher penetrating ability into micropores of rocks and coals assists in access of monomolecules of liquid surfactants through larger depth of treated mass and to enhance efficiency of its weakening. EFFECT: higher efficiency. 4 cl
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