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

Table 2

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

Specimen ID	Confining pressure (MPa)	In the circumferential direction
		CIED (mJ/mm^3)	CEED (mJ/mm^3)	CDED (mJ/mm^3)
S-T-1	5	0.0020	0.0006	0.0014
S-T-2	10	0.0077	0.0018	0.0059
S-T-3	15	0.0118	0.0032	0.0086
S-T-4	20	0.0170	0.0047	0.0123
S-T-5	30	0.0268	0.0084	0.0184
S-T-6	40	0.0395	0.0178	0.0217
S-T-7	50	0.0464	0.0227	0.0237
S-T-8	60	0.0648	0.0363	0.0285