Seismic Acceleration Spectrum of Ground Surface under Urban Subway Tunnels with Circular Cross Sections in Soil Deposits Based on SSI

Table 6

Properties of models that presence of the tunnel amplifies the acceleration spectrum in the tunnel center image on the ground surface.

No.	Elasticity module of soil (compared to Delhi Metro)	Overburden depth (m)	Lining thickness (m)	Tunnel radius (m)	Tn (sec)
1	1	20	0.75	6	1.973
2	1.5	20	0.5	3.13	1.635
3	1	20	0.5	3.13	2.0015