Structural Safety Assessment of Existing Multiarch Tunnel: A Case Study

Table 3

Investigation on the tunnel seepage.

Structure	Main abnormal phenomena	Degree of leakage				Affecting traffic safety		Grade
		I	II	III	IV	Y	N
Arch	Leakage	√				√		3A
			√			√		2A
				√		√		1A
					√		√	B
Side wall	Leakage	√				√		3A
			√			√		2A
				√		√		1A
					√		√	B
Pavement	Sandy soil outflow					√		2A/3A
							√	B
	Waterlogging					√		2A/3A
							√	B