Research Article

A Study of Fractal Deep-Hole Blasting and Its Induced Stress Behavior of Hard Roof Strata in Bayangaole Coal Mine, China

Figure 13

Mises stress nephogram of roof section in the next 0.15 ms after blasting. (a) “Straight-line” blasting layout. (b) “Triangle-fractal” blasting layout. (c) “Deep-shallow-fractal” blasting layout.
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(b)
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