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G. Nikolaidis, C. Saroglou
G. Nikolaidis, C. Saroglou


Block-in-matrix rocks (“bimrocks”) are complex, mixed and heterogeneous formations of competent blocks embedded in weaker matrix. The inherent difficulty of sampling and consequently, laboratory testing of bimrocks leads to considerable challenging in geotechnical design and assessment of their engineering behaviour. An approach for the characterisation of “bimrocks” is the use of stereological analysis that extrapolates one-dimensional or two dimensional data to estimate the block volumetric proportion. This has been an established approach of dealing with bimrocks and melanges for the last two decades. This paper presents the parameters that are considered important for the engineering characterisation of such complex formations, while a case study from a bimrock in NW Greece is discussed.


Bimrock; Mélange; Red Flysch; Ophiolites;

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Goricki, A., Rachaniotis, N., Hoek, E., Marinos, P., Tsotsos, S. and Schubert, W., 2006. Support

decision criteria for tunnels in fault zones, Proceedings of the 55th Geomechanics

Colloquium, Salsberg.

Jacobshagen, V., 1986. Geologie von Griechenland. Berlin, Gebr. Borntraeger.

Marinos, P. and Hoek, E., 2001. The apporpriate use of geological information in the design and

construction of the Egnatia Motorway tunnels. In: Marinos, P. and Marinos, P., eds., Egnatia

Motorway Tunnels, 7/12/2001, 8/12/2001, Ioannina.

Marinos, V., Marinos, P. and Hoek, E., 2005. The geological strength index: applications and

limitations, Bulletin of Engineering Geology and the Environment, 64(1), 55-65.

Medley, E. and Sanz Rehermann, P., 2004. Characterization of bimrocks (rock/soil mixtures) with

application to slope stability problems, Proceedings: Eurock 2004 & 53rd Geomechanics

Colloquium Salzburg.

Medley, E. and Goodman, R.E., 1994. Estimating the block volumetric proportions of melanges and

similar block-in-matrix rocks (bimrocks), Proceedings of the 1st North American Rock

Mechanics Symposium. Jun 1 - 3 1994, Austin, TX, United states, A.A. Balkema, 851-851.

Medley, E.W., 2002. Estimating Block Size Distributions of Melanges and Similar Block-in-Matrix

Rocks. In: Hammah, R., Bawden, W., Curran, J. and Telesnicki, M., eds., 5th North American

Rock Mechanics Symposium (NARMS), July, Toronto, Canada, University of Toronto Press,


Medley, E.W., 1994. The Engineering Characterization of Melanges and Similar Block-in-Matrix

Rocks (Bimrocks), PhD. University of California at Berkely.

Medley, E.W. and Zekkos, D., 2011. Geopractitioner approaches to working with antisocial

mélanges, Geological Society of America Special Papers, 480, 261-277.

Papanikolaou, D., 2009. Timing of tectonic emplacement of the ophiolites and terrane

paleogeography in the Hellenides, Lithos, 108(1), 262-280.

Raymond, L., 1984. Classification of melanges, Geological Society of America Special Papers, 198,


Richter, D., 1976. Das Flysch-Stadium der Helleniden - Ein Überblick, Zeitschrift Der Deutschen

Geologischen Gesellschaft Band, 127, 467-483.

Riedmüller, G., Schubert, W., Steidl, A. and Holzleitner, W., 2002. Prediction of Support for the

Preliminary Design of the Anilio Tunnel (Egnatia Motorway), Felsbau, 20(4).

Robertson, A.H.F., Clift, P.D., Degnan, P.J. and Jones, G., 1991. Palaeogeographic and

palaeotectonic evolution of the Eastern Mediterranean Neotethys, Palaeogeography,

Palaeoclimatology, Palaeoecology. 87(1), 289-343.

Waltham, T., 2009. Foundations of Engineering Geology, 3rd edition. London; New York, Taylor

& Francis, Spon Press.


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