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In-situ Stabilization of Collapsible Soil Using Grouting

Sharifimanesh, Mohamad Javad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54933 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Haeri, Mohsen
  7. Abstract:
  8. The aim of this study is to investigate the feasibility of in-situ stabilization of collapsible soil using grouting. Collapsible soils are a type of problematic soils that are found mostly in arid and semi-arid regions. Loess is stable in its natural unsaturated state, but when it is inundated under a sufficient stress, it will suffer a severe volume reduction due to reduction in matric suction and dissolution of its cementious bonds in water. So, finding a method for in situe remmediation of such a soil is very important especially for the built environments. The collapsible soil used in this study is a loessial soil sampled from the northeast of Golestan province, Iran. The undisturbed sampling from this soil and preparing undistubed laboratory specimens from this soil is very difficult time consuming and expensive. Therefore, recostituted specimens and samples are prepared for this study. Two solutions of calcium chloride and sodium hydroxide have been used to practice in situ stabilization of this soil. In this method, the soil, is compacted in a cubical mold and to facilitate the permeation of the solutions, a hole is created in the center. At first calcium chloride solution and then sodium hydroxide is permeated to the soil through the hole. The two solutions react together to form sodium chloride and calcium hydroxide. The tested collapsible soil is expected to be stabilized by sodium chloride, calcium hydroxide, and geopolymerization. At the end of the permeation, sufficient undisturbed specimens were taken from the stabilized soil. These speciemens were used to perform unconfined compressive stress, conventional double odeometer and unsaturated odeometer and filter paper tests. Similar specimens’ sample was also prepared using unstabilized soil and undisturbed specimens were taken from it and similar tests were performed on them to analyse the behavoir of soil before and after stabilization. The results showed that the susceptibility to collapse decreased by about 80% and the maximum soil compressive strength increased by about 190%. Also, the water retention potential stayed higher in the stabilized soil and the water-soil retention curve moved to the right for that soil when compared to that of unstabilized soil
  9. Keywords:
  10. Soil Stabilization ; Loess Soil ; Collapsible Soils ; Soil-Water Retention Curve ; Injection ; In-Situ Stabilization

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