Study on Creep Characteristics and Constitutive Relation of Fractured Rock Mass

Table 1

Testing schemes of grading unloading pressure in the triaxial creep test.

Number	Fracture characteristics	σ3 (MPa)	σ3 (MPa)
			Level 1	Level 2	Level 3	Level 4	Level 5
A00	Complete coal sample	45	10	8	6	4	2
A30	30° angle	40	10	8	6	4	2
A45	45° angle	35	10	8	6	4	2
A60	60° angle	33	10	8	6	4	2