Application Of FRC In Tunnel Reinforcement
Author(s)
P. Procházka
Abstract
Fibers in concrete should primarily restrain the material from cracks during the
curing process and dehydration. For standard evaluation of the influence of the
fibers, the three or four point test is studied, both experimentally and numerically
on a straight beam. In tunnel lining the situation is slightly different. While the
three or four point test leads to the assessment of the structure being only
bended, in tunnel reinforcement not only this but also bending with normal force
has to be observed. Moreover, the curing is affected by the non-uniform
distribution of moistening, as from the side of the surrounding rock the measure
of wet is principally higher than on the face where ventilation speeds up the
dehydration. These two assumptions are considered and treated experimentally
and numerically. Because a real tunnel lining is too large, a scale model is used
and, consequently, more samples can be studied. Similarity rules and an
appropriate calibration have to be obeyed. This paper is principally focused on
the theory of possible coupled modeling of behavior of the one-sided moistened
tunnel lining.
1 Introduction
Recently, the author published several papers on behavior of steel FRC with
Dramix type fibers in underground structures, especially in tunnel linings, [1].
One-sided moistened concrete beams have been studied from the mechanical
point of view. Scale models were prepared and studied.
The process, which we deal with in this paper, starts with coupled modeling
targeted to description of one-sided moistened beams. Then arches are modeled
and the mechanical properties are taken from the straight beam behavior. From
the numerical point of view a linear system of equations for unconstrained
problem has to be solved and when restrictions are imposed on stresses a
nonlinear problem is to be observed. The solution of such a problem can be
Keywords
Related Book
Other papers in this volume
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