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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Hamma Fabien Yonli1, 2, David Yemboini Kader Toguyeni1 and Moussa Sougoti1
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DOI:10.17265/2162-5263/2017.11.005
Affiliation(s)
1. Department of Physics, the University Ouaga I Pr Joseph KI-ZERBO, BP 7021 Ouagadougou 03, Burkina Faso
2. Department of Civil Engineering, the University of Fada N’Gourma, BP 46 Fada N’Gourma, Burkina Faso
ABSTRACT
Despite the developments of sectors which aim
at valorizing recyclable materials, landfills remain essential in integrated
waste management. The construction of such infrastructures is an engineering
challenge that must be proven over the long term. The purpose of this study is
to understand the modification of the hydromechanical properties of bottom
liners of landfills that may occur during their exploitation under leachate
action. To do so, on the basis of its parameters of nature, a swelling clay
from Burkina Faso is selected from soils of seven localities in Burkina Faso
(West Africa). Laboratory tests carried out with distilled water and then with
a young synthetic leachate show a degradation of the permeability of this clay
from 2.42 × 10-10 m/s
to 1.01 × 10-9 m/s.
In addition, leachate leads to an inhibition of the swelling and a remarkable
increase of its compressibility, inducing significant settlement. With the
increase in permeability, the primary consolidation settlement is increasing
faster. Changes in the hydromechanical behavior can be attributed to the clays
mineralogy, mainly cation exchange and
the development of the diffuse double layer.
KEYWORDS
Bottom liner, leachate, hydraulic conductivity, compressibility, consolidation.
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