SHP Solution Of Effect Of Elevated Temperature
On Tunnel Lining
Author(s)
P. Procházka & S. Peskova
Abstract
Smooth hydrodynamic particle solution seems to be a suitable method for
solving problems of influence of high temperatures on the FR concrete tunnel
lining and surrounding rock. This meshless method suffers from one unpleasant
property: it is not easy to describe the inhomogeneous geometrical boundary
conditions. In our case, the highly elevated temperature is increasing and
decreasing in a time scale on the boundary. After reformulating the problem into
a form obeying boundary conditions being suitable for application of the SPH
method, the 2D problem can be solved. This restriction to 2D is an impact of
assumption that the fire is triggered along the length of the axial direction of
tunnel. This follows from the observation at concrete locations where
conflagrations inside of the tunnels took part. The most extreme temperature is
prevailingly considered at 1200°C to fulfill European standards. As the
mechanical and physical properties change nonlinearly a set of experiments in
furnaces have been conducted to improve the characteristics of the material of
tunnel lining and rock. Coupled modeling is applied to conduct convergence
analysis providing results from experiments and numeric method to be in
compliance. Simultaneous nonlinear equations are first formulated, involving
stress analysis, influence of pore pressure, change of temperature, moisture, and
degree of saturation. Nonlinear mechanical properties are based on the change of
mechanical parameters, as are available from experimental studies. A couple of
examples will follow the theory.
Keywords: smooth particle hydrodynamics method, meshless approach, elevated
temperature, tunnel lining and surrounding rock, partition of unity.
Keywords
smooth particle hydrodynamics method, meshless approach, elevated
temperature, tunnel lining and surrounding rock, partition of unity.
Related Book
Other papers in this volume
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