Le travail de recherche réalisé montre l'utilité de l'essai de dureté de Brinell pour l'évaluation de la résistance de la roche. Les essais étés réalisés sur des échantillons obtenus à partir des puits OMN602 et OMN 402 à Hassi Messaoud, pour différentes profondeurs allant de 1900m jusqu'à 2900m. Il est bien connu que l'essai de dureté de brinell dans le domaine de génie mécanique peut êtres utilisé pour les roches d'une manière similaire qu'aux métaux. Des relations empiriques utiles entre la dureté de brinell et la résistance des propriétés physico-mécanique de la roche ont été trouvées.
Currently, the reinforcement of ordinary concrete with synthetic fibers poses ecological problems because the manufacturing process of these products is very polluting. Plant fiber composites are a new challenge for environmental protection. The present article aims to investigate the mechanical behavior of concrete reinforced with natural fibers, called alfa fibers. Compression and three-point bending tests have been performed on cubic and prismatic samples, respectively. Different fiber lengths (2.5, 5, and 8 cm) and content (0.6, 1.2, and 1.8%by volume) of alfa fibers have been used to examine their influence on the mechanical behavior of the fiber-reinforced concrete. The obtained results show that for a volume content of 1.2% of plant fibers of 5 cm length, the tensile strength of the reinforced concrete increases up to 54.41% compared to the ordinary concrete (BT). However, for content of 1.8% of fibers with 8 cm length, both the compressive and tensile strength of the reinforced concrete decrease slightly. At this level, an excess of both fiber content and their length produces the formation of voids within concrete. Moreover, such an excess made the hydration reaction slower. It is worth noticing that the orientation of fibers also plays a significant role in the nucleation and propagation of microcracks. The fibers arranged both horizontally and obliquely are more resistant to microcracking than those oriented in the loading direction.
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