Construction Sequence Optimization and Settlement Control Countermeasures of Metro Tunnels Underpassing Expressway

Table 1

Physical and mechanical parameters of rock and soil layers.

Type	Bulk density (kN/m^3)	Internal friction angle (°)	Cohesion (kPa)	Elastic modulus (MPa)	Poisson's ratio
Roadbed	20	36	30	15	0.3
Artificial fill	20	25	5	17	0.35
Silty clay	20	10.2	20.9	20	0.23
Sandy mudstone	25.6	31.2	440	2030	0.35
Sandstone	24.7	35	2100	4260	0.14