Coal Permeability Variation during the Heating Process considering Thermal Expansion and Desorption Shrinkage

Figure 4

Relationship between coal deformation and temperature under different stress states.

(a) 1#ε_a

(b) 2#ε_a

(c) 3#ε_a

(d) 1#ε_r

(e) 2#ε_r

(f) 3#ε_r

(g) 1#ε_v

(h) 2#ε_v

(i) 3#ε_v