The Relationship between Current Ground Stress and Permeability of Coal in Superimposed Zones of Multistage Tectonic Movement

Figure 7

(a) The relationship between the stress difference and permeability not divided into superimposed zones. (b) The relationship between the stress difference and permeability on the Zone I. (c) The relationship between the stress difference and permeability on the Zone II. (d) The relationship between the stress difference and permeability on the Zone III. (e) The relationship between the stress difference and permeability on the Zone IV. (f) The relationship between the stress difference and permeability on the Zone V. (g) The relationship between the stress difference and permeability on the Zone VI.

(a)

(b)

(c)

(d)

(e)

(f)

(g)