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Numerical Investigation of Drilled Shafts Bearing Capacity in Cohesive Sand

Jazebi, Majid | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51228 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadi, Mohammad Mehdi
  7. Abstract:
  8. Cemented and cohesive sandy soils are found in many places around the world, including Tehran and Karaj. Therefore, determining the bearing capacity of these soils is important. In this research, some relationships have been established based on geotechnical parameters for drilled shafts in cohesive sandy soils. For this purpose, FLAC software is used for modeling. The elastoplastic Moher-Coulomb constitutive law is used. The verification of the model is done by both experimental and numerical results of other researchers in the sand and clay.The results of modeling show that undrained clayey soils have the greatest effect on the tip and side resistance of drilled shaft. In the clay, the relationship of Vesic (1977) for tip resistance and O'Neil and Reese (1999) and Decourt (1995) relationships for side resistance propose close results to the modeling results.In sandy soils, the soil elastic modulus and the internal friction angle on the tip resistance, and the friction angle and the pile length on the side resistance have a significant effect. The effect of soil unit weight and coefficient of lateral earth pressure on side resistance is greater than the tip. Also, the general relationship proposed for side resistance of sand (f=σ_h^'×tanδ^') suggests close results to the results of this study. In this research, a pattern is proposed to determine the plastic area around the tip of the pile in the sandy soils and some relationships are proposed to determining its dimensions.In cohesive sandy soils, elasticity modulus and internal friction angle have the greatest effect on the tip resistance. Also, pile length and cohesion and friction angle of the soil have a significant effect on side resistance. Also, these types of soils are modeled by both the ABAQUS and FLAC software and provide close-fit results.Also, some relationships have been proposed for tip resistance of drilled shafts in sand, and tip and side resistance in cohesive sand
  9. Keywords:
  10. Bearing Capacity ; Drilled Shaft ; Numerical Modeling ; FLAC Software ; ABAQUS Software ; Cemented Sand ; Cohesive Sand

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