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Evaluation of the Behaviour of Collapsible Soils in Saturated and Unsaturated Oedometer Tests – Case Study of Gorgan Loess

Khorshidi, Morteza | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42598 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Haeri, Mohsen
  7. Abstract:
  8. Collapsible soils are kinds of problematic soils which are susceptible to large and sudden reduction in volume upon wetting. A manifest kind of these soils is loess; catastrophic settlement of structures which are built upon it has been observed when the soil becomes wet. In this investigation the collapse potential of samples of loess taken from Gorgan, Golestan, Iran, has been studied by using unsaturated odometer tests under controlled matric suction. To this end, two modified odometer apparatus with the capability of controlling the matric suction, have been designed and developed. Undisturbed samples of soil have been tested under K0 condition, while the matric suction, volumetric water content, and vertical deformation of the samples have been controlled. Tests were performed under constant matric suction and varying vertical stress (loading and then unloading path) and also, constant vertical stress and varying matric suction (wetting and then drying cycle). Obtained results show the significant effects of the stress path, values of the matric suctions, and net vertical stresses, on both vertical deformation and water contents of the loess. Also, according to the performed tests, the soil is categorized as a soil with high collapsibility. Also, the performed tests show that the soil has high collapsibility. The obtained results are in good agreement with the model proposed by Wheeler and Sivakumar as well
  9. Keywords:
  10. Unsaturated Soil ; Collapsible Soils ; Loess Soil ; Undisturbed Soil Sample ; Unsaturated Odometer Test

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