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Evaluate of Undrained Behavior of Uncompacted Gravely Soil With Triaxial Apparatus Under Anisotropic Condition

Bozorgi, Arash | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42759 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Haeri, Mohsen
  7. Abstract:
  8. The study of the behavior of gravelly soil in undrained condition has been a major topic for researchers for decades. Liquefaction in gravelly soils in recent earthquake has exposed the importance and necessity of investigation on undrained the behavior of gravely soils in earthquakes. In this research, undrained behavior of gravely soils and the effects of initial static shear stress on their behavior have been investigated. In this experimental research a gravelly soil (GP) performed and a triaxial apparatus is used. All tests are performed under consolidated undraiend condition and the specimens are prepared by wet tamping method. The diameter of the specimen was 10 cm and the height was 20 cm. In order to reduce the effects of membrane penetration, a layer of fine sand is added to the periphery of the specimen. Primarily , the samples were put into the freezer , then the frozen samples were placed on the pedestal and they were saturated by water using gravity and to get to a B value of 0.95 or more. Isotropic and anisotropic consolidation steps were conducted under drained condition and shear loading was induced under undrained condition. Tests were done under effective confining pressure of 50, 100, 300, 500 and 800 kPa and initial static shear stress ratio of 0, 0.1, 0.2 and 0.3 on specimens pripared with initial relative density of 0, 25% and 45%. Results showed that the strength of the sample will increase with increasing the relative density and confining pressure. However the samples showed different behavior by increasing the static shear stress. By increasing the relative density and confining pressure the effect of initial static shear stress decreases
  9. Keywords:
  10. Initial Static Shear Stress ; Liquefaction ; Static Triaxial Test ; Critical State ; Gravely Soil Behavior

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