Analyzis of permeabilities of the clayey sediments of Gbédji-Kotovi village in Benin for its valorization in the construction of dikes.

Abstract

Background: In the watersupply mobilization with dikes, embankment or earth dams, it is necessary to find soils, excavated materials for their realization, having a low permeability. Objective: This study aims to determine the permeability of swelling clay soils for the construction of dikes, embankment or earth dams. Results: Their calculation is done in-situ, using the Muntz double ring method and provide low and medium permeability varying between 1.62.(10^ -5)m/s and 2,04.(10^-5)m/s. Taking into account parameters of nature and soil condition in place, it is indirectly measured permeabilities. The last experiment uses the oedometric coefficients of consolidation through Casagrande and Taylor models to calculate the vertical permeability. Conclusion: The two models got possibility to obtain the permeabilities between 9,07.(10^ -12)m/s and 2.59.(10^ -9)m/s. Overall, the low and medium permeabilities of Gbédji-Kotovi clay sediments characterize an impervious or very low permeable clay soil that is likely to act as a watertight backfill for building dikes.