Numerical Modelling of Tunnel Induced Settlement using PLAXIS
Pooja Rajendra Salunkhe, Dr Sandeep Potnis
Plaxis 2D, Lining forces, Constitutive models, New Austrian Tunnelling Method
Due to increasing computing capacities over the past years the use of 3D Finite element analysis in underground design has become more common. Nevertheless, 3D calculations are time consuming and the necessary numerical tools may not always be available. In engineering practice empirical methods and 2D Finite Element analysis are used for tunnel design. The development of stresses and deformations due to tunnelling, however, is a complex three-dimensional problem. Reliable approximations are necessary. In this paper, tunnel induced settlements and internal lining forces are investigated for a non-circular tunnel in clay-/siltstone. The tunnel is constructed according to the principles of the New Austrian Tunnelling Method. 3D FE-analyses are compared with frequently used empirical methods and 2D FE-analyses. To account for three-dimensional stress redistribution in 2D the stress reduction method is used. Different reference values, constitutive models and stiffness parameters are compared. The obtained values are mainly influenced by the used reference value, ground water conditions and drainage type. Furthermore, the initial stress state and the soil model are shown to have an impact on the load reduction factor.
Article Details
Unique Paper ID: 162708

Publication Volume & Issue: Volume 10, Issue 10

Page(s): 865 - 870
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