Dynamic Response Analysis of Underground Double-Line Tunnel under Surface Blasting

Table 3

Quartzite rock properties [21].

Description	Quartzite rock
Weathering condition	Slightly to moderately
Specific gravity (G)	2.65
Density (ρ) (kg/m^3)	2550
Elastic modulus (E) (GPa)	28
Poisson’s ratio (ν)	0.25
Angle of internal friction (φ)	45°
In situ stress ratio (K0)	0.5
Dilation angle (ψ)	5°
Cohesion (c) (MPa)	2.3
σc (MPa)	40
RQD range	75–80
RMR	47