Lognormal Distribution Function for Describing Seepage Damage Process of Single-Cracked Rock

Table 2

The equivalent elastic parameters of the filled fractured rock.

Sample	(GPa)	(GPa)	(%)	(GPa)	(GPa)	(%)	(GPa)	(GPa)
2-1	8.53	4.44	96.1	0.057	0.027	3.9	4.27	6.15
2-2	8.88	4.62	96.1	0.087	0.041	3.9	4.44	7.20
2-3	8.53	4.44	92.1	0.057	0.027	7.9	4.09	6.14
2-4	8.88	4.62	92.1	0.087	0.041	7.9	4.27	7.67
2-5	8.53	4.44	88.1	0.057	0.027	11.9	3.92	6.11
2-6	8.88	4.62	88.1	0.087	0.041	11.9	4.08	6.85

is the elastic modulus of the sandstone; is the bulk modulus of the sandstone; is the percentage of the sandstone to the sample volume; is the elastic modulus of the cement mortar; is the bulk modulus of the cement mortar; is the percentage of the cement mortar to the sample volume. The degradation of elastic modulus is not considered in this test because the MTS seepage test is to load axial stress step by step before failure, and there is no loading and unloading cycles.