Construction of tunnel Bôrik

• Main Authors: Jozef Čížik, Anna Garneková
• Format: Article
• Language: English
• Published: Technical University of Kosice 2009-09-01
• Series: Acta Montanistica Slovaca
• Subjects: geology; primary lining; secondary lining; excavation
• Online Access: http://actamont.tuke.sk/pdf/2009/n1/3cizik.pdf

When tunneling engineers talk on NATM, they often mean different things because some of them define it as a special technique,but others as a sort of philosophy. Recently the scene has been complicated by new terms and even alternative names, when discussingcertain aspects of NATM.The NATM integrates the principles of the behaviour of rock masses under load and monitoring the performance of undergroundconstruction during construction. The NATM is not a set of specific excavation and support techniques. Based on the computationof the optimal cross section, just a thin shotcrete protection is necessary. Additionally, geotechnical instruments are installed to measurethe later deformation of excavation. Therefore a monitoring of the stress distribution within the rock is possible. This monitoring makesthe method very flexible, even at surprising changes of the geomechanical rock consistency during the tunneling work.