Abstract
It is desirable to evaluate new tunneling technologies before they are actually implemented. The Decision Aids for Tunneling (DAT) allow one to simulate tunnel construction and to study the effect of changes in tunneling technology. The effects on tunneling cost and time of potential changes in microtunneling and in tunneling with a full-face TBM have been investigated. After calibrating models of these methods using data from actual tunneling projects, various modifications were introduced, both individually and in combination. The study showed that improvements of individual aspects lead to maximum cost or time savings of 10% to 20%. Simultaneous improvements of several aspects can lead to cost and time savings up to 75%. In addition to these results, the study indicates that the DAT are powerful tools with which most effects on tunnel construction can be investigated.
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