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

Table 3

Description of calculation cases of void.

Calculation cases	Void conditions	Void dimensions
		Void width (m)	Void thickness (m)
Case 1	Base without void	—	—
Case 2	Base with void	2	10
Case 3	Base with void	3	10
Case 4	Base with void	4	10
Case 5	Base with void	5	10
Case 6	Base with void	6	10
Case 7	Base with void	4	20
Case 8	Base with void	4	30