Evaluation of Rock Mechanical Parameters - Rock Mechanics Based on an Anisotropic Jointed Rock Model - page 599

Table 18.14 Black Jurassic (Lias α ), Stuttgart (Germany)
Rock mass

Elastic constants Strength of intact rock Strength of discontinuities Permeability References

Alternating sequence of
sandy limestone layers and
claystone:

Sandy limestone: Alternating sequence of sandy

limestone layers and
claystone:

Alternating sequence of
sandy limestone layers and
claystone:

• Wittke & Grüter (1982)
• Wittke (1990)
• Wittke (1991)
• Wittke et al. (2002)
• Wittke et al. (2003)
• Wittke & Züchner (2008)
• WBI (2004)

k = 10 -6 - 10 -4 m/s E 1 = 750 - 2000 MPa

E 2 = 400 - 1000 MPa
G 2 = 200 MPa
ν 1 = 0.2
ν 2 = 0.15

σ cIR = 30 - 100 MPa φ B = 20 - 25°

c B = 0 - 0.08 MPa
φ J = 35°
c J = 0.02 - 0.1 MPa

Claystone with single
sandy limestone layers:

Claystone: Claystone with single sandy

limestone layers:

Claystone with single
sandy limestone layers:

k = 10 -8 - 10 -6 m/s E 1 = 400 - 1000 MPa

E 2 = 200 - 500 MPa
G 2 = 100 - 200 MPa
ν 1 = 0.25
ν 2 = 0.2

σ cIR = 0.5 - 3 MPa φ B = 15 - 25°

c B = 0 - 0.05 MPa
φ J = 15 - 35°
c J = 0 - 0.1 MPa