The Effect of Confining Pressure and Water Content on Energy Evolution Characteristics of Sandstone under Stepwise Loading and Unloading

Table 1

Compressive strength depending on the water content and confining pressure.

Confining pressure (MPa)	Water content (%)
	0	25	50	100
0	26.32	21.04	16.67	13.96
2.5	41.89	39.23	37.71	30.13
5.0	54.01	48.99	45.46	40.21
7.5	62.84	55.64	52.10	47.69