The Mechanism of Plugging Open-Pit Mine Cannon Holes and the Modification of Plugging Materials

Step blasting is an important part of open-pit mining, which accompanied by hazards such as large blocks, flying stone splashing, noises, and dust during the process. In order to reduce harm caused blasting, this paper uses impact dynamics rock explain deformation damage motion law detonation material blocked gun hole. By simulating in hole, failure characteristics hole are revealed. paper, geological polymer introduced into field mine 700 g powder, 200 slag, 40 NaOH solution (30%), 140 water glass with a modulus 3.2 80 selected prepare polymer-modified plugging materials change powder blockage from bulk solid, improve performance. Finally, test was carried out explosion area, comparative through high-speed photography system; it demonstrated that modified blocking could ability block rate upper step, amount dust, stone, production efficiency safety.