Measurement for monitoring, probing and recording evidence - Tunnel Engineering: Basics and Additional Services for Design and Construction - page 129

4 Measurement for monitoring, probing and

recording evidence

4.1 General

In modern tunnelling, measurement is an important part of the verification of structural
safety. Above all, measurements to monitor the stability parameters (deformation and
stress) and comparison of the measured data with the results of the design calculations
lead to technically and economically more successful tunnel construction. The programme
of measurements must be laid out so that the assumptions made for the structural analysis
and its results can be checked.

Fig. 4-1 shows a flow chart of the tasks of geotechnical measurement technology in the
course of a project and the interaction between design, construction and measurement on
a tunnel project (see also Fig. 3-5).

Figure 4-1 Application
of geotechnical measure-
ment technology for tunnel
projects [25].

Measurements are generally made in and around the tunnel before, during and after the
construction period in order to check the stability of a rock cavity and adjacent structures,
for the final decision of dimensions and to check the effectiveness of the chosen support