Experimental Study on the Influence of Specimen Shape on Rockburst Proneness of Red Sandstone

Table 3

Calculation results of energy density.

Specimen shape	Specimen ID	Unloading point (MPa)	Actual unloading level	At unloading point
				IED (mJ·mm^−3)	EED (mJ·mm^−3)	DED (mJ·mm^−3)
Cylinder	RS-CL-1	—	—	—	—	—
	RS-CL-2	11.03	0.12	0.0085	0.0048	0.0037
	RS-CL-3	30.98	0.33	0.0396	0.0301	0.0095
	RS-CL-4	47.76	0.50	0.0812	0.0608	0.0204
	RS-CL-5	66.52	0.73	0.1353	0.1020	0.0333
	RS-CL-6	86.25	0.85	0.2136	0.1617	0.0519
Cuboid	RS-CB-1	—	—	—	—	—
	RS-CB-2	13.26	0.12	0.0109	0.0065	0.0044
	RS-CB-3	31.23	0.28	0.0395	0.0281	0.0114
	RS-CB-4	52.02	0.55	0.0940	0.0696	0.0244
	RS-CB-5	76.62	0.72	0.1682	0.1268	0.0414
	RS-CB-6	94.42	0.84	0.2611	0.1979	0.0632
	RS-CB-7	103.67	0.95	0.3054	0.2247	0.0807