Experimental Study on Vibration Reduction Technology of Hole-by-Hole Presplitting Blasting

Table 2

Charge increase of reinforced charge section at the bottom of hole in presplitting blasting.

Depth of the hole /m	<3	3 ~ 5	5 ~ 10	10 ~ 15	15 ~ 20
/m	0.2 ~ 0.5	0.5 ~ 1.0	1.0 ~ 1.5	1.5 ~ 2.0	2.0 ~ 2.5
/	1.0 ~ 2.0	2.0 ~ 3.0	3.0 ~ 4.0	4.0 ~ 5.0	5.0 ~ 6.0

Note: is the length of bottom stiffening charge section in meters; is the linear charge density of the reinforcement section of the presplit hole, and the unit is g/m; is the linear charge density of the normal section of the presplit hole, and the unit is g/m.