Three-Dimensional Numerical Analysis of the Tunnel for Polyaxial State of Stress

Table 2

Equivalent parameters under equivalent Mohr-Coulomb failure criterion.

	5 Mpa	10 Mpa	15 Mpa	20 Mpa	25 Mpa	50 Mpa
	2.436 MPa	4.204 MPa	5.972 MPa	7.739 MPa	9.507 MPa	18.346 MPa
	19.47°	19.47°	19.47°	19.47°	19.47°	19.47°

Note: are 0.2 MPa and 30°, respectively, under Mohr-Coulomb failure criterion.