Study of the Growth Process of Original Crack in the Surrounding Rock of Tunnel under the Adjacent Explosive Load

Figure 4

A series of caustics pictures of the explosion loads acting on the original crack of the adjacent tunnels. (a) t = 30 μs, (b)t = 40 μs, (c) t = 50 μs, (d) t = 60 μs, (e) t = 70 μs, (f) t = 80 μs, (g) t = 90 μs, (h) t = 130 μs, (i) t = 150 μs, (j) t = 170 μs, (k) t = 250 μs, (l) t = 270 μs, (m) t = 290 μs, (n) t = 310 μs, (o) t = 330 μs, and (p) t = 350 μs.

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