Abstract
Several failure stretches along the newly completed Ife–Osu–Ilesha highway in South Western Nigeria have been studied. The sub-grade as well as the borrow materials are schist-derived, residual micaceous soils which contain abundant talc and hydromica. The flaky structure of these soils means it is difficult to achieve adequate field compaction. Extensive deposits of amphibolite-derived residual soils also occur in the area, which would provide a more suitable sub-base/fill material. The case study highlights the importance of an engineering geological appreciation of the ground conditions prior to design and construction.
Résumé
Plusieurs zones de rupture le long de l’autoroute Ife-Osu-Ilesha, récemment terminée dans le sud-ouest du Nigeria, ont été étudiées. Les couches de forme ainsi que les matériaux d’emprunt sont constitués à partir de sols résiduels micacés dérivés de schistes qui contiennent beaucoup de talc et des hydromicas. La structure feuilletée de ces sols rend les opérations de compactage difficiles. Or, des gisements importants de sols résiduels dérivés d’amphibolites existent aussi dans cette région. Ils donneraient un matériau de meilleure qualité pour les couches de base. L’étude de cas souligne l’importance des études de géologie de l’ingénieur avant les opérations de conception et de construction de tels projets.
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Meshida, E.A. Highway failure over talc–tremolite schist terrain: a case study of the Ife to Ilesha highway, South Western Nigeria. Bull Eng Geol Environ 65, 457–461 (2006). https://doi.org/10.1007/s10064-005-0037-7
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DOI: https://doi.org/10.1007/s10064-005-0037-7