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Experimental Study of the Effects of Compaction Water Content on Dynamic Properties of Babolsar Sand under Anisotropic Loading

Khorami, Shahriar | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54658 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jafarzadeh, Fardin
  7. Abstract:
  8. In many of the geotechnical engineering projects, such as construction of embankments and roads, soil is compacted with different water contents. Difference in compaction water content leads to different dynamic behaviors under cyclic loadings like earthquake and traffic. On the other hand, the magnitude and the direction of principal stresses on soil element, affect the dynamic response of the soil. The main objective of this research is to study the effects of compaction water content on dynamic properties of soil in anisotropic loading conditions. Therefore, the dynamic parameters of Babolsar sand, including shear strain amplitude, shear modulus and damping ratio under induced anisotropic loading, has been studied in different percentages of compaction water content. To this end, different samples of Babolsar sand with different water contents has been made using the wet tamping method. Then the samples were tested in Cyclic Hollow Cylinder device, developed for unsaturated testing. The results are reported in following sections: 1) The effects of anisotropic loading parameters on shear strain amplitude, shear modulus and damping ratio in different water contents, 2) The effects of compaction water content on shear strain amplitude, shear modulus and damping ration, 3) The effects of anisotropic loading parameters on shear strain amplitude, shear modulus and damping ratio in different net stresses, 4) The effects of net stress on shear strain amplitude, shear modulus and damping ratio, and 5) Shear modulus and damping ratio trends versus compaction water content and net stress, after the modification of shear strain amplitude. According to the results the intermediate stress parameter doesn’t affect the dynamic properties of the Babolsar sand considerably. However, principal stresses direction had a substantial effect on shear modulus and damping ratio of the soil as well as the shear strain amplitude. All the shear modulus and shear strain amplitude trends indicated a maximum value at the angle of 45°, while the damping ratio trends had a minimum value at this angle. Also the variations of shear modulus, damping ratio and shear strain amplitude versus principal stresses direction were symmetric with respect to the angle of 45°. The results also showed that after the modification of shear strain amplitude, the compaction water content doesn’t have any noticeable effect on shear modulus, and it only affects the damping ratio of the soil.
  9. Keywords:
  10. Cyclic Hollow Cylinder ; Shear Modulus ; Damping Ratio ; Babolsar Sand ; Cyclic Strain Amplitude ; Compaction Water Content

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