Experimental Study on Initial Damage Point of Deep Granite under Step Cyclic Loading Method

Table 5

Initial damage stress by cyclic test and initial crack stress by the AE method.

Confining pressure (MPa)	Initial damage stress by cyclic test (MPa)	Initial crack stress by AE method (MPa)	Difference value (%)
10	147	153	4.08
20	181	186	2.76
30	207	215	3.86