FIELD: mining. SUBSTANCE: rock mass is displaced under gravitation. Artificially made series of drilled holes form single hollow-slot coinciding with design surface of sliding. Hollow-slot is formed by hydraulic mining unit and filled with draining material possessing properties of quicksand when filled with water. Upon completion of formation of single hollow-slot, water under pressure is supplied through line row of holes. Weakening of contact results in displacement of rock block. EFFECT: higher efficiency. 3 cl, 2 dwg
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