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Effect of Initial Static Shear Stress on Cyclic Resistance and Undrained Behavior of Gravelly Soils under Low Confining Pressures Using Cyclic Triaxial Apparatus

Raeesi, Ramin | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49419 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Haeri, Mohsen
  7. Abstract:
  8. Study on gravelly soils is one of the topics that Geotechnical Engineering researches have been concentrated on. Although several researches have enlightened the way to understand the behavior of gravelly soils, yet, there are some shortage of information about the dynamic behavior of this kind of soil in undrained condition. In this research, a series of cyclic triaxial tests have been performed using cyclic triaxial apparatus of Advanced Soil Mechanics Laboratory of Sharif University of Technology to study the effect of anisotropic consolidation (initial static shear stress) on dynamic behavior of a kind of gravel. The performed tests were divided into four groups with different initial static shear stresses ( 1.0, 1.1, 1.2 and 1.4). The Cyclic Stress Ratio (CSR) for the specimens of each group were chosen arbitrarily to determine the cyclic resistance of the soil specimens. The effect of membrane compliance has been eliminated during the tests using a flow pump developed at SUT. The results reveal the significant influence of the anisotropy (initial static shear stress) on cyclic resistance and pore pressure generation of the specimens during cyclic loading. The results of the tests indicate that by increasing , the static shear stress ratio correction factor ( ) increases a small amount at first and then decreases to the values even smaller than unity. This means that the cyclic resistance of the specimens will be lower when it is compared to that of the specimens without any anisotropy or initial static shear stress. In addition, imposing initial shear stress to the specimen not only affect the pore pressure generation rate of the specimens, but also affects the amount of pore pressure at the failure
  9. Keywords:
  10. Liquefaction Resistance ; Initial Static Shear Stress ; Gravely Sand ; Cyclic Triaxial Test ; Membrane Compliance

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