Advertisement
Published in:
2020 | OriginalPaper | Chapter
Study on the Behaviour of NATM Tunnel Face During Seismic Activities
Authors : R. B. Jishnu, Ramanathan Ayothiraman, Raghvendra Sahu
Published in: Advances in Computer Methods and Geomechanics
Publisher: Springer Singapore
Activate our intelligent search to find suitable subject content or patents.
Select sections of text to find matching patents with Artificial Intelligence. powered by
Select sections of text to find additional relevant content using AI-assisted search. powered by
Abstract
Tunnelling in mountainous terrain using sequential excavation activities like New Austrian Tunnelling Methods (NATM) methods has been on the rise due to increased haulage and transportation demands. These structures are normally constructed in stages, where exposed tunnel face will be supported by some additional measures. However, in tectonically active places, like in the Himalayas, it is highly possible to have failure at the tunnel face due to seismic activities. In this study, such an excavation is considered using three-dimensional finite element methods. Face stability of such a system is ensured using certain face deformation criteria. Further efficacy of such measures during seismic activities is monitored using pseudo-static methods. For such an analysis, Peak Ground Acceleration (PGA) of a typical earthquake of Himalayan origin is considered. It was observed that proposed face support systems should be enhanced for such excavations in seismically active zones.