Optimization Analysis of Controlled Blasting for Passing through Houses at Close Range in Super-Large Section Tunnels

Table 2

Parameters of the lower step blasting.

Detonator segment	Hole depth (m)	Hole number	Blast hole name	Explosive charge per hole (kg)	Single-stage charge (kg)
1	5	3	Driving hole	1.2	3.6
3	5	6	Driving hole	1.2	7.2
7	5	3	Driving hole	1.5	4.5
9	5	6	Auxiliary hole	1.5	9
11	4.5	10	Around hole	0.9	9
13	4.5	7	Around hole	2.1	14.7
15	4.5	2	Around hole	2.1	4.2
Total	—	37	—	—	52.2

Note: the around hole of the upper section is filled with spacer charge (1 for odd holes and 2 for even holes).