Study on Damage Model and Damage Evolution Characteristics of Backfill with Prefabricated Fracture under Seepage-Stress Coupling

Table 3

Experiment scheme.

Test number	Intact backfill specimens		Backfill specimens with prefabricated fracture		Remarks
	Seepage water pressure (MPa)	Initial confining pressure (MPa)	Seepage water pressure (MPa)	Initial confining pressure (MPa)
1	0	1.5	0	1.5	Samples are saturated
2	0.3	1.5	0.3	1.5
3	0.6	1.5	0.6	1.5
4	0.9	1.5	0.9	1.5
5	1.2	1.5	1.2	1.5
6	0.3	0.5	0.3	0.5
7	0.3	1.0	0.3	1.0
8	0.3	1.5	0.3	1.5
9	0.3	2.0	0.3	2.0