Hf. Schweiger et H. Schuller, Multilaminate models for numerical simulation of tunnel excavations according to NATM, Z ANG MA ME, 81, 2001, pp. S97-S100
Citations number
12
Categorie Soggetti
Mechanical Engineering
Journal title
ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK
Excavation of tunnels with low overburden under unfavourable geological con
ditions can lead to extensive shear band formation in the ground which can
even cause the collapse of the structure. In this paper a constitutive mode
l embedded within the Mulilaminate framework is presented which is able to
capture the mechanism of strain localisation and the formation of shear ban
ds. The model includes deviatoric hardening in the pre-peak range and strai
n softening in the post-peak behaviour. Application to numerical simulation
s of a biaxial test and a shallow NATM tunnel excavation in staged construc
tion sequence demonstrates the potential of the model to predict shear band
formation and possible failure mechanisms with sufficient accuracy for pra
ctical problems.