Study on Structural Service Performance of Heavy-Haul Railway Tunnel with Voided Base

Table 4

Peak values of vertical displacement and velocity of the inverted arch.

Case	Void conditions	Void dimensions		Peak value of vibration displacement (cm)	Peak value of velocity (cm/s)
		Void width (m)	Void thickness (cm)
1	Without void	—	—	−0.26	−1.67
2	Void	2	10	−0.61	−2.1
3	Void	3	10	−0.84	−2.5
4	Void	4	10	−1.04	−3.1
5	Void	5	10	−1.27	−4.4
6	Void	6	10	−2.6	−8.2
7	Void	4	20	−1.14	−3.5
8	Void	4	30	−1.2	−3.9