Experimental Study on Mechanical Properties of Deep Buried Granite under Different Confining Pressures

Table 5

Unloading elastic modulus of hysteresis loops under various confining pressures.

Category of confining pressure (MPa)	Unloading elastic modulus (GPa)
	Hysteresis loop 1	Hysteresis loop 2	Hysteresis loop 3	Hysteresis loop 4	Hysteresis loop 5	Average
0	32	31	31	31	32	32
15	46.2	43.1	41.3	42.3	41.1	40.1
35	46.9	47.6	48.9	46.2	48	42.1
45	60.1	58	58.6	59	49.6	55.9
55	51.6	49.9	51.1	51.1	52	52.6