Reliability Evaluation of Water-Rich Loess Tunnel with Lining Crack Based on Extension Theory

Table 2

Reliability evaluation grade of tunnel lining with crack.

Reliability grade	Width (mm)	Depth (cm)	Length (m)	Geometry	Water seepage (L/m^2·d^−1)
I	0.02∼0.2	0∼10	1.0∼5.0	1.0∼2.0	0.01∼0.10
II	0.2∼1.0	10∼20	5.0∼10.0	2.0∼2.5	0.10∼0.20
III	1.0∼3.0	20∼30	10.0∼20.0	2.5∼3.0	0.20∼0.50
IV	3.0∼5.0	30∼50	20.0∼40.0	3.0∼3.5	0.50∼1.00