| More


Views: 356 Downloads: 291
P. V Marinos
P. V Marinos


The paper deals with the engineering geological behaviour of rock masses in underground excavations. In general, the application of the well-known classification systems has the drawback of not displaying necessary information concerning the behaviour of rock masses, especially the weak ones, in tunnelling. Consequently, there are many cases in which the geological “identity” of the geomaterial is lost since it is not involved in the analysis. In that way it is possible that its special characteristics are mislaid. Within this framework, a system for assessing the failure type mechanisms of the rockmass (i.e. deformation due to overstressing, overbrakes or wedge failure, “chimney” type failure, ravelling ground) for unsupported tunnel-section is presented. These parameters, used for this system, are the structure of the rockmass, the intact rock strength and the overburden thickness. The experience gained by the recent tunnelling construction in the Greek territory, under particularly difficult geological conditions, provided excellent and numerous data for this study.


rock mass classification; tunnelling; weak rock mass; failure type;

Full Text:



Goricki, W., Schubert, G., Riedmueller, G., 2004. New Developments for the design and construction of

tunnels in complex rock masses. International Journal of Rock Mechanics and Mining Sciences, 41(3),


Hoek, E., Marinos, P., 2000. Predicting tunnel squeezing in weak heterogeneous masses. Tunnels and Tunnelling

International, Part 1—November Issue 2000, pp. 45-51; Part 2—December 2000, pp. 34-36.

Marinos, V., Korkaris, K., Prountzopoulos, G., Romosiou A, Fortsakis, P., Mirmiris, K., Petroutsatou, K.,

Koumoutsakos, D., Kiamos, K., Lazaridou, S., Pitsas, G., Rigopoulou, M., Marinos, P., Lampropoulos,

S., 2006. The construction of a geotechnical database for the Egnatia Highway S.A. Proceedings

of the 5th Hellenic Geotechnical, Xanthi 2006, 3, pp. 525-531. (in Greek).

Marinos P. V. (2007). “Geotechnical classification and engineering geological behaviour of weak and

complex rock masses in tunneling”, Doctoral thesis, School of Civil Engineering, Geotechnical Engineering

Department, National Technical University of Athens (NTUA), Athens, July (in greek).

Palmstrom, A., Stille, H., 2007. Ground behaviour and rock engineering tools for underground excavations.

Tunnelling and Underground Space Technology, 27, pp. 363-376.

Poschl, I., Kleberger, J., 2004. Geotechnical risks in rock mass characterisation - Part 1. Tunnels and Tunnelling

International, May issue, pp. 37-39. Part 2., October issue, pp. 36-38.

Potsch, M., Schubert, W., Goricki, A., Steidl, A., 2004. Determination of Rock Mass Behaviour Types -

a Case Study. EUROCK 2004 and 53th Geomechanics Colloquium, Schubert ed., VGE publ.

Schubert, W., 2004. Basics and Application of the Austrian Guideline for the Geomechanical Design of Underground

Structures. EUROCK 2004 and 53th Geomechanics Colloquium, Schubert ed., VGE publ.


  • There are currently no refbacks.

Copyright (c) 2017 P. V Marinos

Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.