Key Blasting Parameters for Deep-Hole Excavation in an Underground Tunnel of Phosphorite Mine

Figure 5

Stress curve of each part of the blasthole. (a) Pressure stress in the charging section. (b) Pulling stress in the charging section. (c) Blocking section compressive stress. (d) Pulling section tensile stress. (e) Rock compressive stress at the bottom of the blasthole. (f) Rock tensile stress at the bottom of the blasthole.

(a)

(b)

(c)

(d)

(e)

(f)