Research Article

The Static Breaking Technique for Sustainable and Eco-Environmental Coal Mining

Figure 12

Crack expansion actual results.
248792.fig.0012a
(a) The number 1 surface
248792.fig.0012b
(b) The number 2 surface
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(c) The number 4 surface
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(d) The number 5 surface
248792.fig.0012e
(e) The number 3 surface