Study on Construction Influence of Shield Tunnel of Urban Rail Transit on Large-Section Mining Tunnel

Table 7

Physical and mechanical parameters.

Parameter types	Constitutive model	Elastic modulus (GPa)	Cohesion (kPa)	Internal friction angle (°)	Poisson’s ratio	Unit weight (kN/m^3)
Soil layer	MC	0.7	100	23.5	0.35	24.1
Initial support	Elastic	30.5	——	——	0.25	26.4
Temporary support	Elastic	34.7	——	——	0.25	27.1
System anchoring bolt	Elastic-plastic	206	150	24	——	79
Advance pipe shed	Elastic-plastic	206	170	30	——	79
Shield segment	Elastic	37.5	——	——	0.2	26.5
Steel shell	Elastic	206	——	——	0.2	79
Equivalent circle zone	Elastic	1.0	——	——	0.2	20.5