Energetic Parameters of Recoil During Explosion-Mechanical Drilling

Background. Modern methods of destruction are spending up to 90 % of energy to prepare for extraction. Specific energy consumption reaches 120 kW?h/m3. The study proposes a new energy efficient destruction of rocks with combined explosive-mechanical loads. Objective. Evidence of explosion-mechanical action machine's recoil absence during explosive charges detonation. Methods. Determination of the factors that cause machine recoil during explosion; the study of the metal jet behavior at the moment of collision with a stope; research of recoil acceleration, speed and impact energy. Results. It is proved that the metal jet acts as a dynamic indenter directed to a stope. After the collision with a stope it "spreads" laterally and generates micro-cracks within 20 mm from the epicenter. Conclusions. The parameters of the machine recoil (acceleration of 0.0002 m/s2; energy 0.02 J) prove the absence of its horizontal and vertical movements during the explosion-mechanical destruction of rocks.