Record details

Title
    3D Modeling of an NATM Tunnel in High K0 Clay Using Two Different Constitutive Models
Author
    Mašín, David
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
Vol./nr.
    Roč. 135, č. 9
Pages
    10
Year
    2009
Thesaurus term
    Clays
    Constitutive models
    Nonlinear analysis
    Three-dimensional analysis
    Tunneling
Keyword
    3D
    Clay
    Constitutive
    Different
    High
    K0
    Modeling
    Models
    NATM
    Tunnel
    Two
    Using
Abstract (in english)
   This paper studies the accuracy of the three-dimensional ?nite-element predictions of a displacement ?eld induced by tunneling using new Austrian tunneling method NATM in stiff clays with high K0 conditions. The studies are applied to the Heathrow express trial tunnel. Two different constitutive models are used to represent London Clay, namely a hypoplastic model for clays and the modi?ed Cam-clay MCC model. Good quality laboratory data are used for parameter calibration and accurate ?eld measurements are used to initialize K0 and void ratio. The hypoplastic model gives better predictions than the MCC model with satisfactory estimate for the displacement magnitude and slightly overestimated width of the surface settlement trough. Parametric studies demonstrate the in?uence of variation of the predicted soil behavior in the very-small-strain to large-strain range and the in?uence of the time dependency of the shotcrete lining behavior.
Contributor
    UK Praha, Přírodovědecká fakulta
Contributor code
    UK, PřF
Source format
    R
Import date
    8. 8. 2012