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<p>For professional tunnel engineers, for whom money and time are in short supply particularly in early stages of a project, this paper critically assesses what works best with the RMR system, today 40 years after its development and extensive accumulated ...
Reference: RAPID EXCAVATION & TUNNELING CONFERENCE, June 2013
<p>During the construction of the Bullet Train lines in Japan, several shallow tunnels were excavated in unconsolidated ground using the New Austrian Tunnelling Method (NATM). However, ground and tunnel settlements frequently occurred due to the low stiffness ...
Reference: Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris 2013
<p>This paper deals with a shotcrete lining with steel sets. The nonlinear analyses of a reinforced shotcrete lining are performed by using fiber beam-column element, which is a forced based element on the Euler-Bernoulli beam theory. The constitutive model ...
Reference: IACSIT International Journal of Engineering and Technology, Vol. 5, No. 6, December 2013
<p>During tunneling in loose grounds, the ground deformation caused by drillings around the tunnel, leads to land subsidence and the adjacent tunnel which would affect tunnel structure and surrounding structures. In such situations it is necessary to improve ...
Reference: Open Journal of Civil Engineering, 2016, 6, 156-162
Since the advent of New Austrian Tunneling Method (NATM), shotcrete as a primary means of support in tunnels has been widely applied. It’s most important features are durability, speed of application and cost effectiveness. This paper introduces some tables ...
Reference: 30th International Conference on Ground Control in Mining
<p>One of the main objectives of this study is to investigate the effect of different parameters on the behavior of excavated tunnel before and after lining activation. The analysis followed the same procedure which had been applied in the analysis of the ...
Reference: Jordan Journal of Civil Engineering, Volume 5, No. 1, 2011
This communication deals with the effect of tunnel face reinforcement on the wall convergence and on the loads in the lining, studied by means of a homogenized anisotropic model for reinforced ground. While the tunneling process is generally handled in a plane ...
Reference: Numerical Methods in Geotechnical Engineering – Benz & Nordal (eds) 2010 Taylor & Francis Group, London
The convergence-confinement method (CCM) for simulating NATM tunnels using plane strain finite element method was in the paper evaluated by comparison with fully 3D simulations. Three real shallow tunnels in urban environment in different stiff clays were ...
Reference: INTERNATIONAL CONFERENCE UNDERGROUND CONSTRUCTION "TRANSPORT AND CITY TUNNEL", PRAGUE 2010, S
The paper investigates these issues using 3D finite element analyses of the near-face region in tunnels excavated in elasto-plastic ground following the Mohr-Coulomb failure criterion. Parametric analyses are performed by varying the density and length of ...
Reference: "2nd International Conference on Computational Methods in Tunnelling, Ruhr University Bochum, 9-11 September 2009"
This paper discusses the application of the Convergence-Confinement method of tunnel analysis to rock masses that satisfies the Hoek-Brown failure criterion. The Shimizu Tunnel has been studied using this method to analyze the structural interaction between ...
Reference: 13th International Conference on AEROSPACE SCIENCES & AVIATION TECHNOLOGY, Egypt, 2009