Study on Mechanical Behavior and Seepage Characteristics of Coal Mass during Unloading

Figure 3

Stress-axial strain, volumetric strain-axial strain, and crack volume strain-axial strain.

(a) A-1

(b) A-2

(c) A-3

(d) A-4

(e) A-5

(f) A-6

(g) A-7

(h) A-8