Experimental Study on the Mechanical Properties and Seepage Characteristics of Red Sandstone with a Single Persistent Joint under Triaxial Compression

Table 5

Parameters of the crack damage threshold corresponding to the linear M-C criterion.

Joint angles		(MPa)	(MPa)	(°)
Intact	7.45	84.22	15.43	49.76	0.987
0°	5.50	56.16	11.97	43.81	0.990
30°	5.15	45.24	9.97	42.44	0.998
45°	3.05	38.01	10.88	30.41	0.935
90°	7.04	52.91	9.97	48.70	0.893

Note: here, we use a subscript “d” for parameters corresponding to the crack damage threshold.