Deformation Control of Subway Tunnels Undercrossing Airport Facilities: A Case Study of the Xinzheng Airport Rail Transit Hub Project

Table 1

Excavation soil layer parameters of Xinzheng Airport Subway Station.

Parameter	Value	Parameter	Value
31C silt elastic modulus E (MPa)	0.15	22B silty clay elastic modulus E (MPa)	0.22
31C silt Poisson’s ratio, ν	0.44	22B Poisson’s ratio, ν	0.39
31B silt elastic modulus E (MPa)	0.28	21 Silty clay elastic modulus E (MPa)	0.19
31B silt Poisson’s ratio, ν	0.42	21 Silty clay Poisson’s ratio, ν	0.45
41A silty sand elastic modulus E (MPa)	0.14	Fracture permeability kf (m^2)	1.17 · 10^−12
41A silt sand Poisson’s ratio, ν	0.44	Synchronous grouting pressure E (MPa)	2
Dynamic viscosity of cement paste μ (Pa s)	1.84 · 10^−2	Soil tensile strength (MPa)	0.05
Soil compressive strength (MPa)	0.1	Cement slurry density	1,300