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Deep-hole blasting in open pit mines generally adopts a continuous charging structure. When the chassis resistance line is large, a dense and powerful explosive can be loaded at the bottom of the blasthole. Segmented charges are used in the following situations:
1. When the blasthole passes through the soft and hard rock layers or large fracture zones with strong strength, wide cracks and small caves that penetrate the atmosphere, it must be blocked by the stuffing material.
Second, the large-aperture drilling hole with a small mesh size, according to the caving volume, the amount of charge per hole is small, in order to make the charge evenly distributed.
3. In the final boundary slope blasting, in order to obtain a smooth surface with high steepness and good stability, smooth blasting and pre-cracking blasting are carried out.
Fourth, in the large hole deep hole blasting, calculate the packing length is greater than 6m.
The segmented charge structure is divided into two types: air and stuffing. The former is generally used in the middle and lower hard rock to adjust the charge length and reduce the explosion pressure in the bore.
September 24, 2024