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In the present study, lab-scale electro-kinetic (EK) treatment was applied to study its efficacy to improve the engineering properties of a soft clayey-silt soil collected from Andal, West Bengal, India with an aim to enhance its shear strength and reduce the consolidation settlement. The collected soil had a free swelling index value of 31% with liquid limit and plasticity index of 35% and 17%, respectively. In the EK treatment, a soil stabilizing agent namely calcium chloride (CaCl2) solution was used in the anode chamber as the anolyte, and sodium metasilicate nona hydrate (Na2SiO3.9H2O) solution in the cathode chamber as the catholyte. Calcium ions from the anode and silicate ions from the cathode moved toward the cathode and anode chamber, respectively, through the combined actions of electro-migration and electro-osmosis flow. A constant electrical potential difference of 1 V/cm was maintained for a period of 14 days until the treatment was completed. The findings of our study showed that the unconfined compressive strength was significantly increased by 180% percent in comparison to untreated soil. A decrement in the free swell index (76%) and Atterberg limits were also observed. The results in the present study indicate that the stabilization of soft clay soil using the electrokinetic process with the aforesaid electrolytes is a promising technology to be considered as an in-situ ground improvement method for soft clayey soil.

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Efficacy Assessment of Electro-Kinetic Treatment for Ground Improvement of Soft Soil

  • 会议论文

  • 发表日期：

    2025年

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  • Shalu Roy,
  • Arindam Karmakar,
  • Sahinur Rahaman Mondal,
  • Supriya Pal

摘要

In the present study, lab-scale electro-kinetic (EK) treatment was applied to study its efficacy to improve the engineering properties of a soft clayey-silt soil collected from Andal, West Bengal, India with an aim to enhance its shear strength and reduce the consolidation settlement. The collected soil had a free swelling index value of 31% with liquid limit and plasticity index of 35% and 17%, respectively. In the EK treatment, a soil stabilizing agent namely calcium chloride (CaCl2) solution was used in the anode chamber as the anolyte, and sodium metasilicate nona hydrate (Na2SiO3.9H2O) solution in the cathode chamber as the catholyte. Calcium ions from the anode and silicate ions from the cathode moved toward the cathode and anode chamber, respectively, through the combined actions of electro-migration and electro-osmosis flow. A constant electrical potential difference of 1 V/cm was maintained for a period of 14 days until the treatment was completed. The findings of our study showed that the unconfined compressive strength was significantly increased by 180% percent in comparison to untreated soil. A decrement in the free swell index (76%) and Atterberg limits were also observed. The results in the present study indicate that the stabilization of soft clay soil using the electrokinetic process with the aforesaid electrolytes is a promising technology to be considered as an in-situ ground improvement method for soft clayey soil.