Progressive Damage Process and Failure Characteristics of Coal under Uniaxial Compression with Different Loading Rates

Figure 5

Relationship between P-wave velocity and stress-strain of samples at different loading rates: (I) compaction stage, (II) elastic deformation stage, (III) yield stage, and (IV) postpeak stage. (a) 0.002 mm/min; (b) 0.004 mm/min; (c) 0.006 mm/min; (d) 0.008 mm/min; (e) 0.01 mm/min.

(a)

(b)

(c)

(d)

(e)