Experimental Research on the Mechanical Performance of the Bolted Rock under Lateral Impact Load: Effect of Prestress, Body Material, and Anchorage Style

Table 2

Experiment scheme and design.

Sample number	Impact velocity (m/s)	Impact energy (J)	Ps (kN)	Pd (kN)
M400-0-0-1000	3.08	1000	25.79	16.24
M400-0-0-2000	4.36	2000	22.97	20.83
M400-0-0-3000	5.34	3000	20.14	22.24
M500-0-0-1000	3.08	1000	24.45	20.45
M500-0-0-2000	4.36	2000	25.79	21.53
M500-0-0-3000	5.34	3000	31.53	31.12
M700-0-0-1000	3.08	1000	31.52	38.31
M700-0-0-2000	4.36	2000	33.02	45.65
M700-0-0-3000	5.34	3000	30.87	28.18
M500-0-15-2000	4.36	2000	23.13	31.71
M500-0-25-2000	4.36	2000	23.10	20.97
M500-0-35-2000	4.36	2000	23.15	18.06
M500-0-45-2000	4.36	2000	22.46	15.84
M400-1-0-2000	4.36	2000	71.80	—
M400-1-0-3000	5.34	2000	77.40	—
M500-1-0-2000	4.36	2000	83.60	—
M500-1-0-3000	5.34	2000	93.41	—

The impact velocity , the impact energy is , is the height of the hammer head, and the mass of the hammer head is 210.69 kg. Ps and P_d are the measured laboratory furniture value of the drop hammer impact force and the peak value of the bolt axial force, respectively. P_s is the second peak value under the full-length anchorage style, and the dynamic axial force of the bolt under full-length anchoring is 0.3. M400-0-0-1000 means that the bolt is HRB400, the first 0 means no anchoring, 1 means full-length anchoring, the second 0 means prestress value, and 1000 means impact energy.