Elastoplastic Analysis of Circular Tunnel Based on Drucker–Prager Criterion

Table 1

The parameters of the common Drucker–Prager yield criterion [21, 22].

No.	Criterion types
DP1	The Mohr–Coulomb criterion based with external corner circumscribed, a circle yield criterion
DP2	The Mohr–Coulomb criterion based with inner corner circumscribed, a circle yield criterion
DP3	The Mohr–Coulomb criterion based with equivalent area, a circle yield criterion
DP4	The Mohr–Coulomb criterion based with matching circles, for plain strain problems with associated flow rules