Uniaxial Compression Creep Relaxation and Grading of Coal Samples via Tests on the Progressive Failure Characteristics

Table 3

Parameters of coal samples under step loading.

Coal number	Progression	/MPa	/%	t/s	/10^−3	/10^−3	/s
MS4	①	5.21	65	568	0.29	0.03	675
	②	6.96	87	1074	1.08	0.18	1831
MS5	①	5.25	62	592	0.02	0.00	700
	②	7.00	83	856	0.23	0.21	1600
	③	8.42	100	25	0.32	0.39	1654
MS6	①	7.90	51	583	0.10	0.10	746
	②	10.46	67	598	0.08	0.09	1404
	③	13.00	84	630	0.09	0.22	2094
	④	15.50	100	205	0.25	2.06	2362