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ENGINEERING GEOLOGICAL BEHAVIOUR OF HETEROGENEOUS AND CHAOTIC ROCK MASSES

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G. Tsiambaos
G. Tsiambaos

Abstract


The engineering characterization of heterogeneous and complex geological formations for estimating their rock mass strength and deformability characteristics constitutes a challenge to geo-scientists and engineers dealing with the design and construction of slopes and tunnels. Mélanges and similar heterogeneous mixtures of hard blocks in weaker matrix, known as “bimrocks”, present an overall strength significantly greater than the matrix strength, because the presence of rock blocks, above a threshold volumetric proportion, influences the mechanical characteristics and the behaviour of these rock masses. Moreover, recent studies have shown that the strength and mechanical behaviour of heterogeneous and composite rock masses such as flysch and molasses consisting of alternating layers of competent and incompetent rocks are governed by the presence and volumetric percentage of the interlayers of the weaker rocks.

Keywords


heterogeneous rock masses; composite rocks; mélanges; rock strength; laboratory testing;

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References


Button E. A., Schubert W., Riedmueller G., Klima K. & Medley E.W., 2003. Tunnelling in tectonic

melanges – accommodating the impacts of geomechanical complexities and anisotropic rock mass

fabrics. International Bulletin of Engineering Geology and the Environment, 63 (2), 109 - 117.

Carter T.G., Diederichs M.S., Carvalho J.L., 2007. A unified procedure for Hoek-Brown prediction of

strength and post yield behaviour foe rockmasses at the extreme ends of the rock competency scale.

th Congress of ISRM, Taylor & francis Group, London, 161-164.

Christoulas S., Kalteziotis N., Gassios E., Sabatakakis N., Tsiambaos G., 1988. Instability phenomena in

weathered flysch in Greece. Proc. 5th Intern. Symposium on Landslides, Lausanne, Vol. 1, 103-108.

Goodman R.E., 1993. Engineering Geology - Rock in Engineering Construction. Smith, M.R. and Collis,

L.,eds., John Wiley & Sons, Inc., 412 p.

Greco O.D., Ferrero A.M., Ogger C., 1993. Experimental and analytical interpretation of the behaviour

of laboratory tests on composite specimens. International Journal of Rock Mechanics & Mining Sciences

and Geomechanics Abstracts, 30(7), 1539-1543.

Hoek E., 2007. Rock Engineering. Course notes, 313 p.

Hoek E., Brown E.T., 1997. Practical estimates of rock mass strength. Int. J. Rock Mech. Min. Sci. Geomech.

Abstr. 34 (8), 1165-86.

Hoek E., Carranza-Torres C., Corkum B., 2002. Hoek-Brown failure criterion – 2002 edition. In: Proceedings

of the fifth NARMS-TAC conference”, Toronto, Canada, July 2002, vol I. Balkema, Rotterdam,

-273.

Hoek E., Marinos P., Marinos V., 2005. Characterization and engineering properties of tectonically undisturbed

but lithologically varied sedimentary rock masses. Int. J. Rock Mech. Min. Sci., 42(2), 277-285.

Kahraman S., Alber M, 2006. Estimating the unconfined compressive strength and elastic modulus of a

fault breccia mixture of weak rocks and strong matrix. Int. J. Rock Mech. Min. Sci. 43, 1277-87.

Kalteziotis N., Tsiambaos G., 1994. Instability phenomena of weathered flysch with reference in the regions

of Ag. Dimitrios and Pili Trikala Dams. Proc. Dam Geology and Greek Experiences, Ed. P.

Marinos, 169-177.

Karzulovic L., Diaz A.J., 1994. Comprehensive approach to rock mechanics applied = Integral approach

to applied mechanics rocks. Assessment of geomechanical properties Gap in El Teniente mine

Braden, 2 v.

Lindquist E.S., 1994. The strength and deformation properties of mélange. PhD thesis, Dept. of Civil Engineering,

Univ. of California, Berkeley, 264 p.

Lindquist H.S., Goodman R.H., 1994. Strength and deformation properties of a physical model mélange.

In: Nelson PP, Laubach SH, editors. Proceedings of the first North American rock mechanics symposium.

Rotterdam: Balkema, 843-850.

Marinos P., Hoek E., 2000. GSI: a geologically friendly tool for rock mass strength estimation. In: Proceedings

of the GeoEng2000 at the international conference on geotechnical and geological engineering.

Melbourne, Technomic publishers. Lancaster, 1422-1446.

Marinos P., Hoek E,. 2001. Estimating the geotechnical properties of heterogeneous rock masses such as

fiysch. Bull. Eng. Geol. Env., 60, 82-92.

Marinos V., 2010. New proposed GSI classification charts for weak or complex rock masses. Bulletin

of the Geological Society of Greece, Proceedings of the 12th International Congress, Patras (under

publication).

Medley E.W., 1994. The engineering characterization of mélanges and similar block-in-matrix rocks (bimrocks).

PhD dissertation, University of California, Berkeley, UMJ, Inc., Ann Arbor, MJ, 387 p.

XLIII, No 1 – 194

Medley E.W., 1997. Uncertainty in estimates of block volumetric proportion in melange bimrocks. In

Proc. Int. Symp. of Int. Assoc. Eng. Geol., Ath ens, Greece; June 23-27; A.A. Balkema, Rotter dam,

vol. 1, 267 - 272.

Medley E.W., 1999. Systematic characterization of mélange bimrocks and other chaotic soil/rock mixtures.

Felsbau-Rock Soil Eng., 17, 152-162.

Medley E.W., 2001. Orderly characterization of chaotic Franciscan Mélanges. Felsbau rock Soil Eng., 19,

-33.

Medley E., Lindquist E.S., 1995. The engineering significance of the scale-indepedence of some Franciscan

Melanges in California, USA. In: Daemen, J.K., Schultz, E.A. (eds.):35th US Rock Mech.

Sym. Rotterdam. Balkema, 907-914.

Medley E.W., and Sanz. P.R., 2004. Charac terization of Bimrocks (Rock/Soil Mixtures) With Application

to Slope Stability Problems. In Schu bert, W. (ed), Proc. Eurock 2004 and 53rd Geomechanics Colloquium,

Salzburg, Austria, Oct 2004.

Moritz B., Grossaeur K., and Schubert W., 2004. Short Term Prediction of System Behaviour of Shallow

Tunnels in Heterogeneous Ground Felsbau. J. of Engineering Geology, Geomechanics and Tunnelling.

(5/2004), pp. 35-43.

Raymond L.A., 1984. Classification of melanges: in Melanges: Their nature, origin and significance.

Special Publication 228, Geol. Soc. of America, Boulder, Colorado; 7-20.

Riedmüller G., Brosch F.J., Klima K. and Medley E.W., 2004. Engineering Geological Classifica tion

of Fault Rocks. Poster at Eurock 2004 and 53rd Geomechanics Colloquium, Salzburg, Austria,

October 2004.

Sabatakakis N., Koukis G., Tsiambaos G., Papanakli S., 2008. Index properties and strength variation

controlled by microstructure for sedimentary rocks. Engineering Geology, 97, 80-90.

Sonmez H., Tuncay E., Gokceoglu C., 2004. Models to predict the uniaxial compressive strength and the

modulus of elasticity for Ankara Agglomerate. Int. J. Rock. Min. Sci., Vol. 41, No.5, 717-729.

Sonmez H., Gokceoglu C., Medley E.W., Tuncay E., Nefeslioglu H.A., 2006. Estimating the uniaxial

compressive strength of a volcanic bimrock. Int. Rock Mech. Min. Sci., 43, 554-561.

Tziallas G., 2010. Estimation of strength and deformability characteristics of composite rocks. MSc Thesis,

Geotecnical Engineering Department, NTUA (in Greek).

Tsiambaos G., Sabatakakis N., 2004. Considerations on strength sedimentary rocks. Engineering Geology,

, 261-273.

Zainab M., Kamaruzaman M., Cho G. C., 2007. Uniaxial compressive strength of composite rock material

with respect to shale thickness ratio and moisture content. The Electronic Journal of Geotechnical

engineering, 13, 1-10.


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