Research Article

Failure Behavior and Energy Storage and Release of Hard Coal under Different Static and Dynamic Loading States

Table 1

Sample grouping and loading situation.

NumberTest method
Dynamic loadingStatic loading

B-1 B-2 C-7 F-1 F-3 F-4 D-1Dynamic compressiveNone
D-3 D-4 D-5 E-1 E-2 E-3 E-4 E-7Dynamic compressive60% of the static compressive strength
A-1 A-3 A-6 A-7Dynamic tensileNone
B-4 B-5 B-6 B-7Dynamic tensile30% of the static tensile strength
C-1 C-2 C-5 C-6Dynamic tensile60% of the static tensile strength
Z1 Z2 Z3 Z4 Z5 Z6 F1 F2 F3 F4 F6 N1 N2 N3 N4NoneStatic compressive
S1 S2 S3NoneStatic tensile