COMPARISON OF TUNNELLING METHODS NATM AND ADECO-RS

• Main Author: Linda Černá Vydrová
• Format: Article
• Language: ces
• Published: Czech Technical University, Prague 2015-04-01
• Series: Civil Engineering Journal
• Subjects: NATM; ADECO-RS; tunnelling methods; advanced core; deformation response of the rock mass
• Online Access: http://www.civilengineeringjournal.cz/archive/issues/2015/2015_1/03-vydrova_1-2015.pdf

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.