Influence of Utility Tunnel on the Lower Part of the Existing Double-Track Shield Tunnel in Loess Soil

Table 2

Soil basic physical property index.

Soil layer	γ (kN/m^3)	E0 (MPa)	ν	β	d	λ	k	e0	M
①1-1 artificial fill	18.1	4.3	0.28	20.24	30.99	—	—	—	—
②1-2 plain fill	17	4	0.33	32.94	67.57	—	—	—	—
③3-1-3 neoloess	18.3	6	0.33	—	—	0.10206	0.00912	0.866	0.77
④3-2-2 paleosol	18.9	8	0.31	—	—	0.07687	0.00782	0.756	0.69
⑤4-4 silty clay	20.1	13	0.3	—	—	0.06514	0.00782	0.64	0.77

γ is the soil bulk density. E₀ is the deformation modulus. ν is Poisson’s ratio. β is the internal friction angle. d is the cohesive strength. λ is the logarithm of plastic bulk modulus. k is the logarithm of bulk modulus of elasticity. e₀ is the initial void ratio of soil. M is the slope of CSL line.