Mechanical Characteristics and Energy Evolution Laws for Red Bed Rock of Badong Formation under Different Stress Paths

Table 4

The analysis of energy parameters when the stress reaches the PS.

Specimen no.	σ3 (MPa)	U0 (MPa)	Ud (MPa)	Ue (MPa)	Ud/U0
b2-2-1	2	0.3108	0.2585	0.0523	0.8317
b2-2-2	4	0.3637	0.3082	0.0555	0.8474
b2-2-3	8	0.3622	0.3152	0.0471	0.8702
b2-2-4	16	1.1158	0.9059	0.2100	0.8119