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This paper shows geometric aspects of rock masses in the Senegaleseside of Kédougou-Kéniéba inlier. The studies are done in one part onsedimentary rocks represented by sandstones with stratification and on the other part in igneous rocks represented by basalts. Geometric studies are thefractal configuration and the scale effect. Scale effect is stud- ied bycomparing the results of mechanical tests done in the laboratory and onoutcrops. For all samples, laboratory pa- rameters are higher thanvalues of field. In this paper, scale effect is characterized by the decrease ofmechanical pa- rameters from laboratory samples to field. The scale coefficient isdefined and characterizes the relation between me- chanicalproperties. More importantly, the scale effect is more significant. Thisscale effect depends largely on the rock anisotropy. The anisotropy depends onthe fracturation and the filling. The scale effect takes into accountthe fracturation, the filling minerals and their diversity which define thecomplexity of the rock. The anisotropy is complex; the impact of scale effecttraduced by an increase of scale coefficient is the highest.Configuration of discontinuities also defines fractal geometry. This fractalaspect appears on the asperities, the spacing and the apertures of discontinuities.The fractal dimension is different from a parameter to another. All these twoparameters estimate the stage of fracturation of the rock in a geologicalsystem and depend one on another if they are studied in the same element.

KEYWORDS

Rock; Scale Effect; Fractal; Kédougou; Sedimentary; Igneous

Cite this paper

D. Sarr, M. Fall, P. Malick Ngom and M. Gueye -New Approach of Geomechanical Properties by Scale Effect and Fractal Analysis in the Kedougou-Kenieba Inlier Senegal-West Africa,- Geomaterials, Vol. 3 No. 4, 2013, pp. 145-155. doi: 10.4236-gm.2013.34019.





Autor: Déthié Sarr, Meissa Fall, Papa Malick Ngom, Mamadou Gueye

Fuente: http://www.scirp.org/



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