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

Table 7

Crack initiation stress and crack damage stress under various confining pressures.

Confining pressure (MPa)	Conventional triaxial test		Cyclic loading and unloading test
	Crack initiation stress (MPa)	Crack damage stress (MPa)	Crack initiation stress (MPa)	Crack damage stress (MPa)
0	58.2	125.1	58.3	132.3
15	75.6	167.9	128.6	181.6
35	98.3	291.5	258.6	322.1
45	89	339.2	142.2	376.2
55	87.2	360.2	140.2	449.5