Elastoplastic Analysis of Circular Opening Based on a New Strain-Softening Constitutive Model and Its Engineering Application in Hydraulic Fracturing

Table 2

Geometrical and physical parameters of circular opening (data from Li et al. [23]).

Parameter	Value
Radius of opening, (m)	0.1
In situ stress, (MPa)	15
Inner pressures, (MPa)	0 or 40
Young’s modulus, (MPa)	1500
Dilatancy coefficient,	1.0
Poisson’s ratio,	0.3
Brittleness coefficient,	0.5
Internal friction angle, (°)	30
Initial compressive strength, (MPa)	8
Residual compressive strength, (MPa)	1