Effect of the Initial Support of the Tunnel on the Characteristics of Rockburst: Case Study and Mechanism Analysis

Table 5

Mechanical parameters of rock mass and lining.

Mechanical parameters	Density (kg/m^3)	Elastic modulus (Pa)	Poisson's ratio	Cohesive strength (Pa)	Tensile strength (Pa)	Friction angle (°)	Shear expansion angle (°)
Rock mass (Tectonic granulite)	28.8	5.5 × 10^10	0.267	8 × 10^6	5 × 10^6	40.0	15
Weak-stiffness lining	28	2.5 × 10^10	0.2	1.5 × 10^7	1.3 × 10^7	35.0	0
Strong-stiffness lining	28	10 × 10^10	0.18	1.8 × 10^7	1.5 × 10^7	35.0	0