| Summary: | 碩士 === 國立成功大學 === 資源工程學系 === 86 === The three dimensional numerical simulation of the three
parallel tunnelsunderexcavation has been conducted by a finite
element analysis package, ANSYS. the effect of tunnel
deformation due to the excavation sequence and the interaction
between adjacent tunnels have been investigated. In this
study, it is found:1. When a three dimensional effect of
tunneling can not be neglected, a three dimensional analysis
is the most direct and realistic approach to be chosen. The
sequence of the tunnel excavation can be conveniently
monitored and modeled by a three dimensional approach.2. The
different sequences of excavation result in the different
plastic flow of the rocks, thus have a substantial effect on
the final total deformation of the tunnels.3. The interaction
between the pilot tunnel and the main tunnel have a greater
effect than the one between two main tunnels.4. Because the
tunnel support system is ignored in this model which results
in a lower stiffness in the system, the numerical results of the
tunnel deformation is higher than the results from the in-situ
measurements.
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