Parameters Optimization of Curtain Grouting Reinforcement Cycle in Yonglian Tunnel and Its Application

Table 1

Parameters of boreholes.

Label	Declination (°)	Dip (°)	Length (m)
L1	−16	−15	36.9
L2	−6	10	35.5
M1	0	0	33
M2	0	7	33.2
R1	17	−17	34.3
R2	7	12	32.9