Research on the Hard-Rock Breaking Mechanism of Hydraulic Drilling Impact Tunneling

Figure 12

The 1st principal stress peak-curves of nodes along the diagonal in models A, B, and C.

(a) Node 28

(b) Node 27

(c) Node 26

(d) Node 25

(e) Node 24

(f) Node 23

(g) Node 22

(h) Node 21

(i) Node 20