Slope stability analysis of cement and silica fume stabilized expansive soil slope

• Published in: IOP conference series. Earth and environmental science Vol. 1336; no. 1; pp. 12002 - 12011
• Main Authors: Chiu, Abraham C.F., Mamoudou Ibrahim, Moumouni, Al-Ajamee, Mohammed, Mary Baguma, Mbabazi
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.05.2024
• Subjects: Cement; Expansive cement; Expansive soils; Hydraulic properties; Impact analysis; Moisture content; Pore pressure; Pore water pressure; Pressure distribution; Rainfall; Rainfall infiltration; Retention; Retention capacity; Safety factors; Silica; Silica fume; Slope stability; Soil analysis; Soil chemistry; Soil properties; Soil stabilization; Soil testing; Soil water; Soil water retention curve (SWRC); Stability analysis; Stabilizers (agents); Unsaturated soils; Water table
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/1336/1/012002

Abstract The objective of this study was to assess the impact of chemical stabilization on slope stability using water retention test data. The analysis focused on hypothetical expansive soil with a 10 m height and a 34° angle. Two critical unsaturated hydraulic properties were considered: (1) soil water retention curve and (2) hydraulic conductivity function. Chemical stabilizers were introduced at varying percentages relative to cement content, with silica fume (SF) partially replacing portions of the cement. The influence of stabilizers on slope stability was evaluated by examining changes in the factor of safety (FOS) with different stabilizer concentrations. Generally, the FOS increased with higher cement content, with further improvement observed when cement was partially replaced by silica fume. Additionally, the addition of silica fume enhanced water retention capacity, as evidenced by altered pore pressure distribution and water table levels post-rainfall infiltration.