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

Table 9

Properties of models that presence of the tunnel amplifies the acceleration spectrum at a distance of 15.17 m from the center of the tunnel projection onto 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	0.28	3.13	2.005
2	1.25	20	0.28	3.13	1.794
3	1.5	20	0.28	3.13	1.6382
4	1.75	20	0.28	3.13	1.5171
5	2.5	20	0.28	3.13	1.27
6	1.25	20	0.5	6	1.7762
7	1.5	20	0.5	6	1.6233
8	2.25	20	0.5	6	1.3287
9	2.5	20	0.5	6	1.2613
10	1.25	10	0.28	3.13	1.8003