Subway Tunnel Construction Settlement Analysis Based on the Combination of Numerical Simulation and Neural Network

Table 1

Reference table of section soil material.

Tab	Parameter	Symbol	Concrete	Marl layer	Clay layer	Plain fill layer	Unit
General	Material model	—	Linear elasticity	Moore-Cullen	Moore-Cullen	Moore-Cullen	—
	Drainage type	—	Nonporous	Drain	Drain	Drain	—
	Natural severity	γunsat	27	17	16	17	kN/m³
	Saturation severity	γsat	—	20	18	20	kN/m³
Parameter	Elastic modulus	Eref	3.10E7	7.50E4	1.00E4	1.30E4	kN/m³
	Poisson’s ratio	V	—	0.10	0.30	0.35	0.30
	Cohesion	C′	—	35	15	10	kN/m³
	Friction angle	ρ	—	31	25	21	(°)
	Dilatancy angle	ψ	—	0	0	0	(°)
Interface	Interface strength	Rinter	Rigidity	Rigidity	Rigidity	Rigidity	—
Initial conditions	Initial horizontal stress coefficient	K0	Automatic	Automatic	Automatic	Automatic	—