Physicochemical and geotechnical evaluation of stability of natural smectite/kaolinite soils as geological discharge site of acidic solid waste in Tunisia

• Autorzy: Benaoun Ines , Marzouki Aidi , Amri Imen , Bali Mahmoud , Hamdi Noureddine

Identyfikatory

DOI

10.24425/sq.2025.154325

• Języki publikacji: EN

Abstrakty

EN

This study aims to investigate the effects of acidic phosphate solution (PS) from phosphogypsum collected from the Tunisian Chemical Group in Gabes, with a pH of 2.6, on the physico-chemical and mechanical properties of Tunisian clay soils, Aleg (AG) and El Haria (EH). Here, the feasibility of employing these soils as natural impermeable barriers for phosphogypsum (PG) disposal sites has been explored. Mineralogical and chemical compositions of raw and modified clays were identified using XRD and XRF. The contact effect of phosphoric aqueous waste in comparison to tap water on raw clays, was revealed by a clear disappearance of the carbonate peak. The drained shear strength of Aleg soil decreased to 48 kPa. Conversely, the cohesion of El Haria soil increased with phosphate solution. Triaxial test results showed c’ and φ’ decreased to 44 kPa and 21° for AG and increased to 155 kPa and 27° for EH. AG and EH clays showed an important support capacity that reached 38 m and 57 m, respectively.

Słowa kluczowe

EN

clay soil; mineralogical analysis; direct shear test; phosphogypsum; discharge site

• Wydawca: Institute of Geological Science Polish Academy of Science
• Czasopismo: Studia Quaternaria
• Rocznik: 2025
• Tom: Vol. 42, Nr 1
• Strony: 41--52
• Opis fizyczny: Bibliogr. 40 poz., rys., tab.

Twórcy

autor

Benaoun Ines

• Higher Institute of the Sciences and Techniques of Waters of Gabes, University of Gabes, 6072 Zrig Gabès, Tunisia
• Laboratory of composite materials and clay minerals, National Center for Research in Materials Science Borj Cedria (CNRSM), B.P. 73-8020 Soliman, Tunisia

autor

Marzouki Aidi

• Higher Institute of Technological Studies of Rades, BP 172, 2098 Radès Medina, Tunisia
• Laboratory of Civil Engineering, Univ. of Tunis El Manar, National Engineering School of Tunis, B.P. 37 Le Belvédère, 1002 Tunis, Tunisia

autor

Amri Imen

• Higher Institute of the Sciences and Techniques of Waters of Gabes, University of Gabes, 6072 Zrig Gabès, Tunisia

autor

Bali Mahmoud

• Higher Institute of the Sciences and Techniques of Waters of Gabes, University of Gabes, 6072 Zrig Gabès, Tunisia

autor

Hamdi Noureddine

• Higher Institute of the Sciences and Techniques of Waters of Gabes, University of Gabes, 6072 Zrig Gabès, Tunisia
• Laboratory of composite materials and clay minerals, National Center for Research in Materials Science Borj Cedria (CNRSM), B.P. 73-8020 Soliman, Tunisia

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