Civil Engineering Reference
In-Depth Information
Figure 11-1
General
diagram of the tunnel-
ling machine selection
process
The analysis in the geotechnical report, the ground profile (Step 1) and the system behav-
iour (Step 2) provide the basis for the selection of a suitable tunnelling machine. In Step 3,
an exclusion procedure is used to find excavation processes, which are suitable in princi-
ple for individual tunnel sections. Taking into consideration the transport behaviour of the
excavated material (Step 4) and the analysis of the recycling potential of the excavated
material (Step 5), there then follows a further limitation to the optimal process for the spe-
cific technical and economic constraints of the project (Step 6). In the last step (Step 7), it
is recommended to divide the tunnel into homogeneous sections for the selected process.
A longitudinal section showing the tunnelling technologies is a particularly useful form
of diagram, which can also be used as a contract document for construction planning and
estimating and should thus also include all contract-relevant geotechnical parameters.
These recommendations define the key process-relevant geotechnical parameters for the
analysis in the geotechnical report (Step 1) and are then restricted to the analysis of sys-
tem behaviour (Step 2) and the preliminary selection of the tunnelling machine (Step 3).
The subsequent steps should be carried out for the specific project, also considering the
economic aspects.
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