A Study on Seismic Isolation of Shield Tunnel Using Quasi-Static Finite Element Method

Table 1

Equivalent stiffness of the shield tunnel.

Segment ring width	Ls	m	1.0
Segment sectional area	As	m^2	3.81
Segment sectional inertia moment	Is	m^4	11.23
Segment elastic modulus	Es	kPa	3.75 × 10^7
Sum of tension stiffness of ring joints	Kj	kN/m	4.83 × 10^6
Equivalent compression stiffness		kN	1.43 × 10^8
Equivalent tension stiffness		kN	4.67 × 10^6
Equivalent bending stiffness		kN·m^2	3.59 × 10^15