Experimental Study on Creep Behavior and Crack Evolution of Stratified Structural Sandstone under Segmental Constant Load

Table 2

Viscoelastic parameter estimation results.

Number	(MPa)	(MPa)	(GPas)	(GPas)	Stress (MPa)	Condition
USN-1	807.2	67.3			20.3	Undamaged
USN-2	408.1	39.8			22.9	Damaged
USN-3	604.7	34.6			25.4	Damaged
USN-4	755.3	11.8			27.9	Damaged