Research on the Large Deformation Prediction Model and Supporting Measures of Soft Rock Tunnel

Table 2

Physical and mechanical parameters of rock mass.

Surrounding rock category	Layer thickness (m)	Weight (kN m^−3)	Elastic modulus (GPa)	Poisson’s ratio	Cohesion (MPa)	Internal friction angle (°)
Powder clay	14	20.4	0.042	0.25	1.46	46
Sand stone	27	17.3	0.014	0.32	0.026	30
Argillaceous rock	19	16.5	0.006	0.35	0.043	37
Ordinary mortar bolt	—	81.3	200	0.30	—	—
Resin anchor	—	76.6	280	0.28	—	—