Evaluation of Rock Mechanical Parameters - Rock Mechanics Based on an Anisotropic Jointed Rock Model - page 600

Table 18.15 Claystone of the Lower Cretaceous, Konrad mine, Salzgitter (Germany)
Rock mass

Elastic constants Strength of intact rock Strength of discontinuities Permeability References

k < 10 -10 m/s

E = 1500 - 4000 MPa
ν

σ cIR = 15 - 25 MPa φ RM = 5 - 15°

c RM = 1 - 4 MPa

• WBI (1991)

= 0.3 - 0.4 • WBI (1993)

• WBI (1994b)

Table 18.16 Claystone with limestone intercalations, Nuttlar (Germany)
Rock mass

Elastic constants Strength of intact rock Strength of discontinuities Permeability References

k = 10 -7 - 10 -4 m/s E = 1000 - 7000 MPa

ν

σ cIR = 50 - 150 MPa φ B = 20 - 25°

c B = 0 - 0.015 MPa
φ J1/J2 = 25 - 30°
c J1/J2 = 0.01 - 1 MPa

—

= 0.2 - 0.25