Experimental Study of Stress-Seepage Coupling Properties of Sandstone under Different Loading Paths

Table 3

Characteristic parameters under various stress states.

Sample number	MPa	MPa			MPa		MPa
SY-1	0	0	5.441	5.494	40.85	0.382	89.50	0.837
SY-2	5	0	5.393	5.921	47.77	0.386	102.40	0.827
SY-3	5	1	6.902	6.982	65.90	0.521	106.70	0.843
SY-4	5	3	6.126	6.411	41.70	0.446	79.80	0.853
SY-5	10	0	7.740	6.281	87.01	0.577	125.80	0.834
SY-6	10	1	6.971	7.287	77.90	0.537	129.70	0.893
SY-7	10	3	6.712	6.826	63.13	0.493	105.10	0.820
SY-8	15	0	5.166	7.939	77.81	0.437	149.90	0.852
SY-9	15	1	6..263	7.322	75.55	0.483	131.40	0.841
SY-10	15	3	7.026	6.577	78.50	0.537	125.40	0.858

¹Initial axial strain, ²damage threshold stress, ³damaged inflection point stress.