Comprehensive Risk Evaluation in the Long-Term Operation of Urban Subway Based on Multiple Indices

Table 10

Risk level determined by different methods.

Evaluation methods	Indices	Weight	Calculated value	Threshold	Risk level
TRL	Maximum ground settlement (mm)	0.0436	3.1572	Level 2: 2.4–3.7	Moderate
	Maximum rate of ground settlement (mm/d)	0.1606
	Geological conditions	0.3549
	Maximum settlement of tunnel (mm)	0.3089
	Lining leakage	0.0618
	Density of surface structures	0.0468
	Disturbance of tunnelling	0.0234
Zhejiang provincial code	Accumulated ground settlement (mm)		27.29	Low risk: 300 mm	Low
Tianjin provincial code	Maximum rate of ground settlement (mm/a)		54	High risk: > 50 mm/a	High