Impact of landfill leachate contamination on the geotechnical behavior of granitic sandy-clayey soil

This study investigates the impact of landfill leachate contamination on the geotechnical properties of granitic sandy-clayey soil, with implications for sustainable soil management and remediation strategies. Laboratory experiments were conducted to simulate contamination scenarios by incorporating leachate at concentrations of 0%, 5%, 10%, and 20% by dry weight. A Comprehensive suite analyses including particle size distribution, pH measurement, X-ray diffraction (XRD), scanning electron microscopy (SEM), specific gravity assessment, and soil organic content characterization was performed. Key geotechnical properties, such as Atterberg limits, hydraulic conductivity, and shear strength, were also evaluated. The findings revealed that leachate contamination significantly altered soil properties, leading to reducing shear strength, decreased liquid and plastic limits, and increasing permeability. These changes pose substantial risks to soil stability and infrastructure sustainability in regions adjacent to landfills. This study advances knowledge on leachate-induced soil degradation and offers actionable insights for achieving sustainable landfill and soil management practices and promoting long-term environmental stability.