 This study compares the mechanical factor of soils reinforced with four different fibers, utilizing an integrated methodology that includes 351 laboratory experiments and extreme learning machine technique to develop functional relationships between mechanical factor and soil and fiber parameters. Soils reinforced with synthetic fiber, polypropylene and natural fibers exhibit different characteristics when subjected to the same variation in soil parameters due to differences in surface morphology and water absorption capability of polypropylene compared to other natural fibers, with polypropylene soil composite showing maximum sensitivity to soil moisture and least sensitivity toward soil density and fiber content among all tested fiber soil composites. This article was authored by Ankit Gogh, Sanandam Baudeloy, Somnott Mundal and others.