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Study of the Shear Stress Effect on the Behavior of Collapsible Soils and Introducing an Innovative Consecutive Model: “Three linear Stages” to Predict Behavior of Gorgan Loess

Saberi, Saeed | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54585 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Haeri, Mohsen
  7. Abstract:
  8. In all five continents, existence of collapsible soils such as Loess has been reported. These kinds of soils have mutual properties such as open structure, high void ratio and low dry density. Collapsible soils are always at risk of experiencing significant reduction in volume due to increasing water content or degree of saturation. Hence, this kind of soil can lead to serious problems including reduce of load bearing capacity, excessive deformation and failure of foundations.Collapsible soils exist in several regions of Iran. Consequently, researching their properties is a key point of geotechnical studies in our country. Hence, in past 10 years, several studies have been conducted by master’s and PhD students of Sharif University, which include this thesis as well. In this study, reconstituted specimens of Gorgan Loess soil were set in two different stress paths to simulate similar conditions of collapsible soils under foundation of structures. wetting path under constant net stress and consolidation under anisotropic stress were those applied stress paths. The first step was helping one of the senior students who has been trying to change the existing triaxial device to an unsaturated stress-controlled apparatus. Further, by developing this new ability on the triaxial device and reaching to required standards, tests were conducted under stress-controlled situation and during the tests, water content and volume change were measured simultaneously.In the meanwhile, study of exist unsaturated models were conducted. This study leads to introducing a new consecutive model, “Three Linear Stages”, which is well-associated with hydro-mechanical behavior of collapsible soils, especially Gorgan Loess. To evaluate this innovative model, the tests’ results of prior experiments of geotechnical students of Sharif University has been utilized
  9. Keywords:
  10. Unsaturated Soil ; Collapsible Soils ; Loess Soil ; Constitutive Sand Model ; Unsaturated Triaxial Device ; Soil-Water Retention Curve ; Hydromechanical Behavior

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