Influence of Water Inrush from Excavation Surface on the Stress and Deformation of Tunnel-Forming Structure at the Launching-Arrival Stage of Subway Shield

Table 3

Basic parameters of components in the launching-arrival stage of shield tunneling in the XW interval.

Model component	Unit weight (kN/m^3)	Elastic modulus (MPa)	Poisson ratio	External diameter (m)	Internal diameter (m)
Shield machine block	78.5	210000	0.125	6.4	6.2
Over excavation soil	20	0.8	0.2	6.48	6.4
Grouting layer (soft)	20	7	0.2	6.48	6.2
Grouting layer (hard)	25	50	0.3	6.48	6.2
Bolt	78.5	210000	0.125	0.03	—
Segment	30	30000	0.3	6.2	5.5
Soil reinforcement	20	100	0.3	—	—