Study on Dynamic Characteristics of Deep Siltstone under High Static Stress and Frequent Dynamic Disturbance

Table 2

Accumulative impact times under a different static stress in test.

Specimen number	Static stress (MPa)	Accumulative impact times
ss1-1	35	28
ss1-2	35	21
ss1-3	35	25
Average	35	25
ss2-1	15	45
ss2-2	18	45
ss2-3	20	45
Average	18	45
ss3-1	55	10
ss3-2	55	8
ss3-3	55	11
Average	55	10
ss4-1	65	3
ss4-2	65	6
ss4-3	65	5
Average	65	5