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

Table 5

Original blasting parameters for the bedrock section.

Serial number	Hole name	Serial number	Holes number	Diameter (mm)	Depth (mm)	Load		Blasting order	Connection type
						Volume	kg/circle
1	Cutting blasthole	1∼8	8	1600	5200	9	57.6	I	Series-parallel connection
2	2^nd circle blasthole	9∼20	12	3000	5000	7	67.2	III
3	3^rd circle blasthole	21∼37	17	4500	5000	7	95.2	V
4	4^th circle blasthole	38∼59	22	5900	5000	7	123.2	VII
5	5^th circle blasthole	60∼91	32	7100	5000	7	179.2	IX
	Total		91				522.4