In order to find solutions to the increasing environmental problems in general and civil engineering in particular, several methods have been adopted. For example, synthetic and natural materials are increasingly used for soil improvement. In recent years, basalt fibers have been used for reinforcing concrete. But it is difficult to find the articles on the use of basalt fibers to strengthen the soil. It is in this perspective that this work is oriented on the study of mechanical behavior of

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... solidated saturated silty soils reinforced by basalt fibers. This study is conducted by using basalt fiber which is a natural and non-polluting material to improve the mechanical and physical properties of the soil by offering additional resistance to shear strength. The study involves adding different percentages (1%, 1.5% and 2%) of basalt fibers of different lengths of 6 mm, 12 mm and 24 mm in the silty soil. To properly conduct this study, 40 triaxial undrained unconsolidated tests (UU) were conducted on saturated silty soils which were consolidated under 100 kPa vertical stress. The results of these tests show that the addition of the basalt fiber has greatly enhanced the shear strength of the soil used in this study. The best improvement is observed for basalt fiber at 1.5% and 24 mm long. This improvement is expressed by an increase in the cohesion of this soil.