Study of Two-Step Parallel Cutting Technology for Deep-Hole Blasting in Shaft Excavation

Table 6

Blasting parameters after optimization.

Serial number	Hole name	Serial number	Holes number	Diameter (mm)	Depth (mm)	Load		Blasting order	Connection type
						Volume	kg/circle
1	Upper cutting	1∼8	8	1600	5200	3	19.2	I	Series-parallel connection
1	Lower cutting		8	1600	5000	6	38.4	II
2	2^nd circle blasthole	9∼20	12	3000	5000	7	76.8	III.
3	3^rd circle blasthole	21∼37	17	4500	5000	7	108.8	V
4	4^th circle blasthole	38∼59	22	5900	5000	7	140.8	VII
5	5^th circle blasthole	60∼91	32	7100	5000	7	179.2	IX
	Total		91				563.2