Study on the Mix of Slurry Membrane for Soil Conditioning of EPB Shield and Its Application Effect in Water-Rich Gravel Strata

Table 5

Formation material parameters.

Stratum type	Thickness (m)	Bulk weight (ρd) (kg·m^−3)	Elastic modulus (E) (MPa)	Poisson’s ratio (ν)	Cohesion (C) (kPa)	Internal friction angle (φ)/°	Permeability coefficient (k) (m·s^−1)	Porosity (n)
Plain fill	1.9	1200	9.2	0.41	8	9	1 × 10^−5	0.474
Medium dense gravel	1.35	1720	37	0.25	0	34	8.1 × 10^−4	0.361
Dense gravel	46.1	1520	42	0.25	0	35	1 × 10^−3	0.445
Silty clay	1.2	1650	11	0.3	18	29.4	3.5 × 10^−6	0.427