Study of a Space-Time Monitoring of High-Speed Railway Underline Structure Using Distributed Optical Vibration Sensing Technology

Table 1

Model material parameters.

Material number	Material	ρ (kg/m^3)	E (GPa)	µ
1	Concrete	2400	34.5	0.2	0.05
2	CA mortar	1400	25	0.168	0.05
3	Defect	1100	0.001	0.45	0.05
4	Rock layer	2600	27	0.22	0.05
5	Basement	2300	25	0.25	0.05