Coupled Modeling Of Tunnel Face Stability Using Desai’s Theory And TFA
Author(s)
J. Trčková & P. Procházka
Abstract
Coupled modeling of the behavior of structures (mutual comparison of
experimental and numerical models) becomes a very powerful tool for
assessment and design. In this paper we concentrate on the assessment of the
tunnel face from an experimental and numerical point of view. The experiments
start with scale modeling from physically equivalent materials, while the
numerical method involves the finite element method with the constitutive law
by Desai and transformation field analysis serves as a tool for improvement of
the numerical model, which should soon be close to reality.
1 Introduction
In this paper, coupled modeling based on a comparison of numerical models and
experimental scale modeling is put forward. Possible time dependent behavior,
creep for example, can be accurately obtained from the coupled modeling. The
scale models are prepared from physically equivalent materials, while for
numerical modeling classical 24 nodal point degrees of freedom finite elements
are used.
The comparative approach consists in the following idea. First, select
subdomains with uniform distribution of eigenparameters, see [1], for example.
Theoretically one can select as many subdomains as nodal points used in the
computation. But in this case the calculation can exceed reasonable
computational time and from the nature of the problem the subdomains can be
estimated in advance to lower the number of free eigenparameters. Then, one can
write the overall stress as a linear hull of stresses due to external load in a purely
linear elastic medium and uniformly distributed eigenparameters in subdomains,
Keywords
Related Book
Other papers in this volume
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