Numerical Simulation on the Evolution of Mining-Induced Fracture Network in a Coal Seam and Its Overburden under the Top Coal Caving Method

Figure 11

Evolution of the fractal dimension of the fractures in the overburden strata in the vertical section planes: (a) pebbly sandstone; (b) siltstone; (c) mudstone; (d) medium sandstone 1; (e) fine sandstone; (f) medium sandstone 2.

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