Parametric Evaluation of Simultaneous Effects of Damaged Zone Parameters and Rock Strength Properties on GRC

Table 1

List of affecting parameters on the GRC included in the database.

bi	Radius of the tunnel	m′	Material constant of the EDZ
Ν	Poisson ratio of the rock mass	s'	Material constant of the EDZ
mi	Material constant of intact rock	a′	Material constant of the EDZ
σ0	In situ hydrostatic confining pressure	γ^p	Strain softening parameter
GSIp	Peak Geological Strength Index of the rock mass		Young’s modulus in the inner annulus of the EDZ
D	Disturbance factor		Young’s modulus in the outer annulus of the EDZ
E	Young’s modulus of rock mass	REDZ	Radius of the excavation-induced damaged zone
ɸp	Peak friction coefficient	b	Intermediate principal stress parameter
ɸr	Residual friction coefficient	Ui	Convergence (displacement)
γ^p∗	Critical deviatoric plastic strain parameter	Pi	Internal support pressure