Experimental Investigation on the Energy Storage Characteristics of Red Sandstone in Triaxial Compression Tests with Constant Confining Pressure

Table 3

Three energy parameters of red sandstone specimens in the total direction.

Specimen ID	Stress level (MPa)	In the total direction
		TIED (mJ/mm^3)	TEED (mJ/mm^3)	TDED (mJ/mm^3)
S-T-1	5	0.0033	0.0016	0.0017
S-T-2	10	0.0118	0.0047	0.0071
S-T-3	15	0.0197	0.0086	0.0111
S-T-4	20	0.0286	0.0139	0.0147
S-T-5	30	0.0493	0.0258	0.0235
S-T-6	40	0.0734	0.0467	0.0267
S-T-7	50	0.0944	0.0622	0.0322
S-T-8	60	0.1375	0.0946	0.0429