Adaptability of the Cutter-Head of the Earth Pressure Balance (EPB) Shield Machine in Water-Rich Sandy and Cobble Strata: A Case Study

Table 2

Mechanical parameters of strata.

Stratum	Density (kN/m^3)	Young’s modulus (MPa)	Poisson’s ratio	Internal friction angle (°)	Cohesion force (kPa)
Miscellaneous fill	17.5	1.5	0.37	10	8
Plain fill	18.5	6.2	0.32	20	15
Slightly dense cobbles	21.4	29.6	0.30	38	0
Moderately dense cobbles	21.8	34.0	0.27	44	0
Highly dense cobbles	22.0	38.5	0.22	48	0
Mud stone	22.4	60.0	0.21	41	60