Relationship between Fractal Dimension of Fragmentation Degree and Energy Dissipation of Rock-Like Materials under Initial Stress

Table 2

SHPB test design.

Test category	Impact air pressure (MPa)	Confining pressure (MPa)	Number of test pieces
Dynamic tension	0.08, 0.1, 0.12, 0.14, 0.16	0	15
Dynamic compression	0.15, 0.2, 0.25, 0.3	0	12
	0.35, 0.50, 0.65, 0.80	0.7/0.86/1.0/1.15/1.3/1.45	72