COMPARISON OF TUNNELLING METHODS NATM AND ADECO-RS
DOI:
https://doi.org/10.14311/CEJ.2015.01.0003Keywords:
NATM, ADECO-RS, tunnelling methods, advance core, deformation response of the rock massAbstract
The New Austrian Tunnelling Method (NATM) has been often used in the Czech
Republic in last two decades. One of the methods, without application in the Czech Republic,
is an Italian method called ADECO-RS, which has reached significant use in Italy and some
other countries. It is the method of controlled deformation, which uses mainly the horizontal
anchoring of the tunnel face to reinforce the area in front of the face (advance core). This
technology is especially important in weak and soft rocks where is necessary to excavate
quickly and smoothly with minimum disruption of initial stress state of the rock mass in the
vicinity of the excavation. The use of NATM can be in some cases uneconomical and
technically inadequately challenging and in such cases would be appropriate to choose
another technology.
Given the facts above, in the Czech environment there is no data available for
comparison of these methods not only in terms of numerical modelling, but also in terms of
feasibility and usability.
The paper summarizes history of the tunnelling methods and it is closer devoted to
NATM and ADECO-RS tunnelling approaches. The basic principles of both methods are set
and further the comparison of these methods is made on a theoretical level.
The paper hereinafter includes the analysis of fibreglass face anchors application
during the construction of three-aisled Veleslavín Station and the impact assessment of tunnel
face anchoring during the excavation of ventilation tunnel on the newly built part of the Prague
Metro „V.A“.
The paper also deals with practical knowledge gained during the technical visit of Italian
Val di Sambro Tunnel which is built according to ADECO-RS approach. These findings are
essential for the correct interpretation of Lunardi method.
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References
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