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Stabilization and Improvement of Collapsible Soils, Using Electrokinetics & Nanomaterials and Assessment Its Strength Parameters by Unsaturated Oedometer

Hosseini, Arash Mohammad | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47001 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Haeri, Mohsen
  7. Abstract:
  8. Loess as a kind of collapsible soils is a well-known Aeolian deposit, which is characterized by some specific Engineering properties including high initial void ratio, relatively low initial density and water content and high percentage of fine-grained particles. Collapsible soils such as loess, sustain large stress under dry condition. However, they experience a high and sudden decrease in their volume by reaching to their critical moisture content. As a result, their natural condition is not suitable for construction works if the possibility of the exposure of the soil to excessive water is present. This research presents the utilization of an innovative method for stabilization and improvement of Gorgan loessial soil. This method uses Electrokinetics and Nanomaterials as an in-situ remedial measure to instigate addetives to move through soil pores through ion migration phenomena. In order to assess the deformation and strength behavior of improved collapsible soil and comparing with those of unimproved soil, several Unsaturated Oedometer tests under constant vertical stress and varying matric suction were performed. The result showed the effect of matric suction on the behavior of both improved and unimproved samples. The resistant of the soil were highly dependent on the water content and matric suction. The Oedometer tests on samples improved by 3% Lime and 5% nanomaterials showed considerable improvement of Collapse potential. Results also showed that stabilized samples experienced notably lower volume decrease under the same induced stresses
  9. Keywords:
  10. Nanosilica ; Suction Controlled Oedometer ; Unsaturated Soil ; Electrokinetic Process ; Loess Soil ; Undisturbed Soil Sample ; Collapsible Soils

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