Experimental Evaluation of Electro-Osmotic Flow in the Improvement of Saturated Cohesive Soils
Keywords:
Experimental Evaluation, Electro-Osmotic, Flow, Improvement of Saturated Cohesive SoilsAbstract
Improving saturated cohesive soils remains a significant challenge in geotechnical engineering due to their low shear strength and high compressibility. Electro-osmotic flow presents a promising technique for enhancing soil performance without the need for large-scale mechanical intervention.
Objective: This study evaluates the behavior of saturated cohesive soils under electro-osmotic treatment, focusing on changes in physical and consolidation properties over time. Key variables include applied voltage, electrode material, and treatment duration.
Methodology: Laboratory tests involved preparation of cohesive soil samples (pure clay and a clay-silt mix), followed by electro-osmotic treatment using stainless steel 316 electrodes at 15V and 30V. The experiments incorporated moisture content analysis, compaction, and one-dimensional consolidation tests, with durations ranging from 7 to 28 days. Aluminum and iron electrodes were excluded to prevent corrosion-related interference.
Findings: Electro-osmotic flow significantly affected moisture migration, soil density, and consolidation behavior. The clay-silt mix showed higher permeability, resulting in greater water movement and improved settlement. Extended durations (28 days) amplified the electro-osmotic effects, while higher voltages (30V) accelerated consolidation. The maximum consolidation coefficient was recorded in the mixed soil under high voltage after 21 days.
Conclusion: The results demonstrate that electro-osmotic flow can effectively improve saturated cohesive soils, especially when considering soil type, voltage level, and treatment period. These findings support the use of electrokinetic stabilization methods in soft ground improvement for infrastructure and foundation projects
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