Numerical Analysis on the Behavior of Existing Tunnels Subjected to the Undercrossed Shield Tunneling at a Small Proximity

Table 1

Soil parameters.

No.	Soil stratum	Volumetric weight	Compression modulus	Consolidated quick shear test		Coefficient of horizontal stress	Poisson’s ratio
		γ (kN/m^3)	Es1-2 (MPa)	cq (kPa)	φq (°)	K0
③1	Silty clay	20.2	6.45	30	15	0.74	0.30
③	Silt	20.2	8.71	20	26	0.55	0.28
③3	Fine sand	20.1	4.52	0	28	0.53	0.30
④2	Silt	20.8	12.18	18	24	0.76	0.28
④	Silty clay	20.5	8.43	26	14	0.36	0.27
⑥	Silty clay	20.3	10.35	35	15	0.55	0.29