Novel horizontal trenching and vertical deep borehole initiation method for deep concave strip mine

• Main Authors: WANG ZHIZHONG, MU WENFEI, XU LIANSHENG, ZHANG BAOCAI
• Format: Patent
• Language: Chinese; English
• Published: 10.12.2008
• Subjects: AMMUNITION; BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; WEAPONS

The invention discloses a deep open pit new level trenching vertical deep hole initiating method. The trenching first initiating adopts offset center point initiation, slotting is arranged in the middle, and initiation between the neighboring holes and rows adopts millisecond order. Initiation of other areas adopts offset center point initiation, slotting is arranged in the middle, and initiation between the neighboring holes and rows adopts millisecond order. The coefficient K value of the delay time between holes and rows is set. The initiating method has strong operability, which is practical, safe and reliable, and ensures the former initiating hole create a free face for the after initiating hole. Explosion energy should be distributed uniformly among the blast holes. The blast holes are extruded and crushed many times when initiating. The crushing lumpiness of blasting muck pile, the loose of the blasting muck pile and the shape of the blasting muck pile can be effectively controlled. The quality of ini