Numerical Analysis on the Behavior of Existing Tunnels Subjected to the Undercrossed Shield Tunneling at a Small Proximity

Table 2

Parameters of the linings.

Type	Segment width	External diameter	Internal diameter	Elastic modulus
	l (m)	D (m)	d (m)	E (m)
Existing tunnel	3	6	5.4	34.5 × 10^3
New metro line	1.2	6.4	5.8	34.5 × 10^3