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

Table 5

Thickness of acrylic models.

Project	Shield tunnel segment (C50)		Initial support (C25)		Temporary support (C25)
	Elastic modulus (GPa)	Thickness (mm)	Elastic modulus (GPa)	Thickness (mm)	Elastic modulus (GPa)	Thickness (mm)
Prototype	34.5	300	28	300	28	250
Model	2.86	12.68	2.86	11.83	2.86	9.85

Considering the joint effect of the shield segment, the equivalent stiffness is reduced to 80% of the C50 reinforced concrete and the thickness of the similar material is about 10 mm.