A New Strain-Softening Constitutive Model for Circular Opening considering Plastic Bearing Behavior and Its Engineering Application

Table 3

Geometry and material mechanics parameters.

Parameters	Value
Radius of opening, (m)	1
In situ stress, (MPa)	1
Young’s modulus, (MPa)	5000
Dilatancy angle, (°)	0 or 30°
Poisson’s ratio,	0.2
Strain-softening coefficient,	2.5
internal friction angle, (°)	35
Initial cohesion, (MPa)	0.276
Residual cohesion, (MPa)	0.055
Shear stain increment,	2.5e-5