Evaluating Long-Term Strength and Time to Failure of Sandstone with Different Initial Damage

Table 5

LTS value of the rock specimens obtained by methods 1 and 4.

Initial damage state	LTS (MPa)
	Method 1	Method 4	Absolute value of difference
D1	28.3	28.8	0.5
D2	27	27.2	0.2
D3	26.45	26.0	0.45
D4	24	24.4	0.4

Note. Methods 1 and 4 denote the isochronous stress-strain curve method and the intersection of the steady creep rate method, respectively.