Research on the Safety Thickness of Tunnel Outburst Prevention in Water-Rich Fault Fracture Zone Based on Janssen’s Theory

Table 2

Calculation results of the tunnel critical safety thickness in fault fracture zone.

Calculation method	Numerical simulation	Formula in this paper	Meng formula	Fu formula	Xu formula
(m)	11.5	11.98	1.93	10.39	8.88
Relative error (%)	—	4.2	83.2	9.7	22.8