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

Table 8

Correlation degrees of tunnel lining, evaluation grades, and results comparison of the difference methods.

Sections	Correlation degree				Extension theory	Probabilistic statistic	Comparing specification
	I	II	III	IV
K1	−0.252	0.038	−0.253	−0.645	II	II	II
K2	−0.129	−0.257	−0.136	−0.567	I	I	I
K3	0.009	−0.349	−0.401	−0.653	I	I	I
K4	−0.129	−0.360	0.015	−0.780	III	III	III
K5	−0.071	−0.156	0.108	−0.563	III	II	IV
K6	−0.315	−0.241	−0.376	−0.093	IV	III	IV

Stability of water-rich loess tunnel with lining crack is divided into four classes named very good (I), good (II), fair (III), and poor (IV) by the orders of stability from the highest to the lowest.