Performance of New Austrian Tunneling Method (NATM) in Weak Rock Case Study


  • Heba Kamal
  • . .





NATM Tunnelling, Performance, PHASE 2, Strengen Tunnel, Weak Rock.


The decline in the over ground utilizable space and increment in development of metro structures, cut and cover structures are winding up fairly difficult to conceptualize and build. In this examination, a nonlinear two dimensional limited component investigation was completed to show the New Austrian Tunneling Method (NATM) burrow developed in frail shake utilizing the business limited component with joint programming PHASE 2.The validity of the numerical modeling procedure performed by the author was checked by making back-analysis for an actual case study of Strengen Tunnel which is one of the biggest expressways in western Austria.  A comprehensive parametric study was performed on a hypothetical circle tunnel. Two dimensional numerical simulations with the finite element with joint software PHASE 2 have been performed to ground behaviour with   the results of the numerical analysis are presented and   discussed for recommendations for future work. In general the tangential stress at side wall and crown  obtained from  finite element with joints are  nearly equal or higher than the closed form solution and equivalent continuum.




[1] Barla, G., Barla, M., “ Continuum and Discontinuum Modelling in Tunnel Engineeringâ€, Gradevinar Vol. 52 Num 10, 567-576 (2000).

[2] Brown, E.T., J.W. Bray, B. Ladanyi, E. Hoek, “Characteristic line calculations fur rock tunnelsâ€, J. Geotec . Eng. Div. Am. Soc. Civ. Enp. 109. pp.15-39 (1983).

[3] Panet , M . , “ Le calcul des tunnels par la method convergence- confinementâ€, Presses de 1'Ecole Nationale des Ponts et Chaussees (1995).

[4] Hoek, E, E. , T.Brown , 1997, Practical estimates of rock mass strength. Inl. J. Rock Mech. Mn Sci. Vol. 34, pp.1156- 1186.

[5] Hock, E., M. W ., Grabinsky, M. S. Dicdcrichs , 1991, The work described in this paper was carried out with Numerical modelling for underground excavation design: Trans. Int. Min. Metal Vol100. January-April1991, PP. A22-A30.

[6] Stratfield ,A. M., Cundall, P. A., 1 988 , Towards a methodology for rock mechanics modelling. Inf. J. Rock Mech. Min. Sci, Vol. 25, pp. 99- 106.

[7] Rocscience Inc. “Phase2 2D Finite Element Analysis for Excavations and Slopesâ€, Version 7, Toronto, Canada (2008).

[8] Vanek, R., Fasching, A., “Geological and geotechnical ground investigation for New Semmering Base Tunnel in Austriaâ€, Tunnel, 22. Rocnik, pp.18-24 (2013).

[9] Shen , B . , N . Barton , 1997, The disturbed zone around tunnels In jointed rock masses. lnf. J. Rock Mech. Min. Sci. Vol. 34, pp. 117-125.

View Full Article:

How to Cite

Kamal, H., & ., . (2018). Performance of New Austrian Tunneling Method (NATM) in Weak Rock Case Study. International Journal of Engineering & Technology, 7(4.20), 40–45.
Received 2019-01-13
Accepted 2019-01-13
Published 2018-11-28