Research on the Deformation Law of Jointed Surrounding Rock during Tunnel Excavation Based on Hydromechanical Coupling

Table 2

Stratum parameters.

Stratum	Density (kN/m^3)	Elastic modulus (GPa)	Poisson’s ratio	Cohesion (MPa)	Internal friction angle (°)	Tensile strength (MPa)
Hard stratum	26	20	0.3	1.6	55	0.8
Soft stratum	22	6	0.35	0.6	45	0.35