Impact Dynamic Properties and Energy Evolution of Damaged Sandstone Based on Cyclic Loading Threshold

Table 1

Uniaxial compressive strength of sandstone specimens with different degrees of damage.

Cyclic load threshold	Number	Stress (MPa)	Average stress (MPa)
0.2σb	1	59.83	58.97
	2	59.21
	3	60.02
	4	56.19
	5	57.38
	6	61.21
0.4σb	1	58.04	55.76
	2	54.52
	3	55.38
	4	58.73
	5	53.68
	6	54.22
0.6σb	1	42.45	45.57
	2	48.62
	3	45.77
	4	47.73
	5	44.85
	6	44.01
0.8σb	1	25.74	26.86
	2	26.43
	3	22.98
	4	30.88
	5	28.41
	6	26.73