Abstract
This work shows the Kedougou-Kenieba inlier (eastern Senegal) pillow lavas behavior from laboratory to field. Some uniaxial tests are carried out on five types of specimens of pillow lavas. These types of specimens are: macroscopicly healthy rock, fractured rock without filling, fractured rock filled with epidote, chlorite and calcite and rocks with tension crack filled with quartz. The Young moduli and the uniaxial compression strength are good for the healthy rock. The Young moduli fall slightly for facies with horizontal cracks while uniaxial compression strength (Rc) varies slightly. For filled fractured specimens, Rc and Young modulus (E) decrease remarkably. Decreases are most important for cracks filled with epidote, chlorite and calcite than with quartz. That is due to the differences of rigidity between these materials. Also, the slope stability of hillsides in this area depends on to these characteristics.
Highlights
The Kédougou-Kéniéba inlier has long been subject of geological research and significant gold’s reserves are found
Measurements of mechanical parameters are carried on the hill located on the interface of Badian-BafoundouMaragoukoto and data are regrouping by discontinuities affinities
Highest Young moduli are obtained with healthy basalts (Figure 5(a)) without visible discontinuities
Summary
The Kédougou-Kéniéba inlier has long been subject of geological research and significant gold’s reserves are found. It becomes necessary to know the rocks behaviors in this area. The pillow lavas are the basaltic facies more represented in this area. It outcrops very well in this area with relatively the same geological characteristic. We choose the Badian hill to conduct geomechanical studies on this specimen This hill is crossed by a very dense network of fractures and tension cracks filled or not by secondary crystallization. Some of these discontinuities may be recognized in the field but for others, microscopic observations are necessary. We will highlight the impact of these fillings on the rocks behaviors. We are going to use the stereographic method
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