Experimental Study on Triaxial Unloading Failure of Deep Composite Coal-Rock

Table 2

Unloading test results at different rates.

Sample number	Height (mm)	Diameter (mm)	Unloading rate (MPa·s^−1)	Fracture load (kN)	Compressive strength (MPa)
1#	97.580	49.540	0.050	98.052	50.910
2#	98.880	49.520	0.100	91.972	47.715
3#	101.520	49.640	0.200	90.932	46.985