Disaster Risk Evaluation of Superlong Highways Tunnel Based on the Cloud and AHP Model

Table 3

Classification of a quantitative risk indicator.

Number	Quantitative indicator	Classification
		Low risk	Moderate risk	High risk	Extreme risk
C16 C36	Shape of tunnel section/m^2	0∼<10	10∼<50	50∼<100	≥100
C17	Reserved deformation/mm	≥120	80∼<120	50∼<80	30∼<50
C25	Length of single excavation/m	0∼<1	1∼<2	2∼<3	≥3
C27	Depth of tunnel burial/m	0∼<50	50∼<500	500∼<1000	≥1000
C35	Depth of tunnel burial/m	≥500	100∼<500	20∼<100	0∼<20