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

Table 1

Three energy density parameters of red sandstone specimens in the axial direction.

Specimen ID	Axial pressure (MPa)	In the axial direction
		AIED (mJ/mm^3)	AEED (mJ/mm^3)	ADED (mJ/mm^3)
S-T-1	5	0.0013	0.0010	0.0003
S-T-2	10	0.0042	0.0029	0.0013
S-T-3	15	0.0080	0.0055	0.0025
S-T-4	20	0.0118	0.0092	0.0026
S-T-5	30	0.0227	0.0174	0.0053
S-T-6	40	0.0345	0.0291	0.0054
S-T-7	50	0.0485	0.0394	0.0091
S-T-8	60	0.0735	0.0587	0.0148