Parametric Study on the Ground Control Effects of Rock Bolt Parameters under Dynamic and Static Coupling Loads

Table 4

Model design with different bolt lengths.

Model	L (mm)	φ (mm)	Lg (mm)	S (mm)
L1	1800	20	1000	900
L2	2000	20	1000	1000
L3	2200	20	1000	1100
L4	2400	20	1000	1200

L is the bolt length, φ is the bolt diameter, Lg is the bolt spacing, and S is the grouting length.