Table 2.

Retention models used in the modelling

MaterialSymbol/definitionParameters
Host rock and tunnel backfillS(Ψ)=(1+(Ψp0)11m)m


krel(S)=S(1(1S(1/m))m)2
Host rock:
p0 = 1.74 Pa, m = 0.6

Tunnel backfill:
p0 = 2.50 M Pa, m = 0.5
BentoniteS(Ψ)=(1+(Ψp0)11m)m(1Ψp1)m1


krel(S)=S3
p0 = 5.523 MPa, m = 0.16
p1 = 950.0 MPa, m1 = 1.6