Research on Tunnel Surrounding Rock Failure and Energy Dissipation Based on Cyclic Impact and Shear Loading

Table 2

Impact times under different rotation speeds and impact speeds.

Rotation speed (rpm)	Impact speed (m/s)
	7.2	9.4	11.2	13.6	16.8
0	45	37	22	12	6
28	43	36	19	11	6
66	39	33	17	10	5
120	35	26	14	6	4
255	30	24	12	5	2
375	27	23	11	4	2