Safety Assessment of Tunnel Shield Construction for Existing Adjacent Bridges

Table 2

Material calculation parameters.

Name	Material	Volumetric weight, (KN/m^3)	Elastic modulus, E (MPa)	Poisson Ratio υ
Pile foundation	C30	24	30000	0.2
Bearing platform	C40	24	32500	0.2
Tunnel segments	C50	25	34500	0.2
Shield machine shell	Steel	78.5	210000	0.3
Grouting area	Grouting slurry	22	120	0.24