Mechanical Responses to Different Excavation Methods of Qichongcun Tunnel in Guiyang City, China

Table 1

Geotechnical parameters.

Unit	Elastic modulus (GPa)	Poisson’s ratio	Cohesion (kPa)	Friction angle (°)	Bulk density (kN/m^3)
Sandstone	3.5	0.3	2,000	38	26
Dolomite limestone	2.5	0.2	1,200	35	26
Argillaceous limestone	1.5	0.25	500	35	25