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

Table 3

Parameters of the upper step after optimization.

Detonator segment	Hole depth (m)	Hole number	Blast hole name	Explosive charge per hole (kg)	Single-stage charge (kg)
1	2.5	1	Cutting hole	1.2	4.8
1	2	4	Cutting hole	0.9
3	4.5	12	Cutting hole	1.5	18
5	4	12	Cutting hole	1.2	14.4
7	3	8	Driving hole	0.9	11.7
7	3	5	Floor hole	0.9
9	3	11	Driving hole	0.9	13.5
9	3	4	Floor hole	0.9
11	3	11	Driving hole	0.9	17.1
11	3	6	Inner ring hole	0.9
11	3	2	Floor hole	0.9
13	3	15	Inner ring hole	0.9	17.7
13	3	2	Floor hole	0.9
13	3	2	Floor hole	1.2
15	3	21	Around hole (odd)	0.3	18.3
15	3	20	Around hole (even)	0.6
—	—	42	Damping hole	—	—
—	—	4	Empty hole	—	—
Total	—	182	—	—	115.5

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