Fatigue Life Characteristics of Segmental Lining Structure for the Shallow Buried Metro Tunnel under the Dynamic Load of a High-Speed Railway

Table 2

Physical and mechanical parameter of different strata.

No.	Thickness; /(m)	Density; /(kg/m3)	Elasticity modulus; /(MPa)	Poisson ratio	Friction angle; /(°)	Cohesive force/(kPa)	Rayleigh damping
							α	β
1	2.0	1880	10.15	0.43	15	18	0.021	0.093
2	4.0	2000	57.15	0.26	18.1	17.5	0.026	0.094
3	6.2	2050	60.435	0.25	33	48	0.039	0.063
4	6.2	1910	57.15	0.32	18.1	23.5	0.054	0.045
5	4.6	2760	650	0.15	28	400	0.047	0.053