Numerical Analysis for Dynamic Response of In Situ Blasting Expansion of Large Cross-Section Tunnel with Small Net Distance

Table 1

Physical-mechanical parameters of materials.

Material	Density (kg·m^−3)	Elastic modulus (GPa)	Poisson’s ratio	Yield stress (MPa)
Surrounding rock	2300	3.0	0.35	10
Initial support	2400	4.5	0.30	15
Secondary lining	2700	30.0	0.20	20