Surface Settlement Analysis Induced by Shield Tunneling Construction in the Loess Region

Table 2

Numerical analysis schemes for a single factor.

Influencing factors	Parameter’s range					Calculate required parameters
β	0.3	0.4	0.5	0.8	0.9	H = 19 m, R = D/2 = 3.1 m, Gp = 160 mm, i = 8.17 m; Es1 = 6.6 MPa, Es2 = 5.5 MPa, Eu = 25.6 MPa, e0 = 0.76, νu = 0.50, ν0 = 0.39, γ = 19 kN/m^3,  = 0.64; cu = 20.9 kPa, c′ = 35.5 kPa, φ′ = 24.4°; P0 = γH −  = 281 kPa,  = 80.0 kPa; = γ(H − ) + γ′( − R) = 253.1 kPa,  +  = 242 kPa
ω	0.8	0.85	0.9	0.95	0.99
λ	0.5	0.7	0.9	1.0	1.2
κ	0.1%	0.5%	1.0%	1.5%	2.0%
ξ	0.1%	0.8%	1.5%	2.5%	3.0%
η	1.01	1.05	1.1	1.2	1.5
ψ	0.02	0.07	0.14	0.21	0.28	= 8.0 m, when Δh ≤ 0.5(H − ), Δh = 0.5(H − ) = 5.5 m, and Δh ≤ R +  = 11.1 m
θ	0.69	0.94	1.19	1.31	1.38
Rd	0.03	0.08	0.a13	0.16	0.2	hd = 3 m