Analysis on the Influence of Increasing Seismic Fortification Intensity on Seismic Performance of Underground Station

Table 2

Relationship between dynamic shear modulus ratio, damping ratio, and shear strain.

Soil	Depth (m)	Experimental results	Shear strain
			5 × 10^−6	1 × 10^−5	5 × 10^−5	1 × 10^−4	5 × 10^−4	1 × 10^−3	5 × 10^−3	1 × 10^−2
Silty clay	9.2	G/G0	0.9859	0.9958	0.9652	0.9235	0.777	0.5478	0.1744	0.1075
		λd	0.0245	0.0383	0.0554	0.0694	0.117	0.137	0.1759	0.1755
Silty clay	20.5	G/G0	0.9969	0.9988	0.9654	0.9248	0.7070	0.5480	0.1752	0.1081
		λd	0.0185	0.0282	0.04542	0.0478	0.1001	0.1176	0.1519	0.1550
Silt sand	32.5	G/G0	0.9973	0.9986	0.9543	0.941	0.7277	0.5775	0.2129	0.1155
		λd	0.0177	0.0285	0.0453	0.0594	0.0973	0.1778	0.1485	0.1559
Silty clay	46.3	G/G0	0.9866	0.9982	0.957	0.9361	0.7474	0.5941	0.2266	0.1577
		λd	0.0187	0.0287	0.0453	0.0609	0.1076	0.1279	0.1687	0.1665
Silt	65.3	G/G0	0.9864	0.9988	0.9548	0.932	0.7726	0.577	0.216	0.1206
		λd	0.0288	0.0288	0.0559	0.065	0.1073	0.1284	0.1616	0.1668
Silty clay	78.0	G/G0	0.986	0.982	0.9655	0.9258	0.7179	0.5571	0.1996	0.1106
		λd	0.0188	0.0282	0.0415	0.0561	0.1037	0.1771	0.1666	0.1644