Performance of Slurry Shield Tunnelling in Mixed Strata Based on Field Measurement and Numerical Simulation

Table 1

Physical and mechanical properties of the stratum.

Strata layer	Bulk density (kN/m^3)	Young’s modulus (MPa)	Poisson’s ratio	Friction angle (°)	Cohesion (kPa)
Pavement	25	1366	0.3
Silt	20.1	41.25	0.3	25.2	24.3
Silty clay1	19.9	37	0.3	18.4	33.8
Pebble soil1	20.2	226	0.28	45
Silty clay2	20	38	0.3	19.6	36
Pebble soil2	20.2	226	0.28	45