Study on the Large Deformation Characteristics and Disaster Mechanism of a Thin-Layer Soft-Rock Tunnel

Table 1

Ratio of crustal stress to R_c in the Muzhailing Tunnel area.

No.	Measuring depth
1	250	11.37	20–30	1.76–2.64
2	270	12.14	20–30	1.65–2.47
3	300	11.37	20–30	1.76–2.64
4	320	14.93	20–30	1.34–2.01
5	365	14.84	20–30	1.35–2.02
6	370	17.98	20–30	1.11–1.67
7	397	16.28	20–30	1.23–1.84
8	427	18.76	20–30	1.07–1.60