Study on the Fractal Characteristics of Coal Body Fissure Development and the Law of Coalbed Methane Migration of around the Stope

Figure 7

The calculation results of porosity and fractal dimension of each grid. (a) The relationship between fractal dimension and porosity. (b) The relationship between fractal dimension and vertical distance from coal seam No.8’s floor. (c) The relationship between the fractal dimension and the distance from foot of perpendicular to coal seam No.8’s.

(a)

(b)

(c)