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

Table 9

Values of monitored factors involved in the evaluation.

Objective	Criteria	Index (unit)	Values
Risk level	Regional surface settlement	Maximum ground settlement (mm)	27.29
		Maximum rate of ground settlement (mm/d)	0.15
		Geological conditions	Soft formations
	Operation of subway	Maximum settlement of tunnel (mm)	68.18
		Lining leakage	Completely impermeable
	Disturbance of construction	Density of surface structures	Dense high-rise buildings
		Disturbance of tunnelling	Disturbance depth < 0.8 m