Seismic Response Study of Tunnels Running underneath a Subway Station in Parallel

Table 1

Calculation parameters of each material.

Material	Density (kg/m^3)	Elastic modulus (MPa)	Poisson’s ratio
Soft soil (0–40 m)	1800	208	0.45
Hard soil (40–50 m)	2000	917	0.3
Concrete (station and tunnel)	2500	3.510^4	0.2