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is assumed to be elastic. In case 5 shear parameters of c
B
= 0,
φ
B
= 15°, c
J
= 0,
φ
J
= 20° and zero tensile strength normal to the discontinuities are assumed and an
iterative viscoplastic analysis is carried out.
Figure 10.44
Advancing vault excavation with open invert: geometry, overburden and
parameters (Wittke 1990)
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