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Numerical Modeling of Cone Penetration Tests in Saturated Clayey Soil under Undrained Conditions

Fakhimi Akmal, Mahdiyeh | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56062 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadi، Mohammad Mehdi
  7. Abstract:
  8. This study aims to numerical modeling of piezocone penetration test (CPTu) in saturated clayey soils under undrained conditions using FLAC-2D software. According to the available studies, measuring excess pore water pressure during the piezocone penetration test can play an important role in determining the characteristics and engineering parameters of clayey soils. In many geotechnical problems, the initial state of existing stresses in the ground and are an important parameter that must be known for designs and analysis. The relationship between vertical and horizontal effective stress under zero lateral deformation is usually expressed by the coefficient of lateral earth pressure at rest. Since the coefficient of lateral earth pressure at rest, K0, and vertical effective stress are essential parameters in the designs and analysis of many geotechnical problems, such as earth retaining structures, piles, and slope stability; Therefore, this research aims to investigate the effect of these two parameters on the excess pore water pressure around the cone (in the direction of the friction sleeve and along the tip of the cone) in clayey soils. In order to investigate soil behavior and the excess pore water pressure in two different states of the coefficient of lateral earth pressure and vertical effective stress, numerical modeling was done. First, the numerical modeling of the piezocone penetration tests process is compared with the results and measurements of the piezocone laboratory tests in the calibration chamber, the centrifuge tests, as well as the valid numerical modeling available in the literature. In the second part, the effect of these two parameters was investigated in the direction of the friction sleeve, and relations for the distribution of excess pore water pressure in this direction ( and ) were presented according to these conditions. In the third part, along the cone tip, the effect of these two parameters on the excess pore water pressure was investigated, and the relationship between the excess pore water pressures ( and ) was presented using these parameters. The validation of proposed relationships was also checked using the results of the calibration chamber tests and the database of field tests available in the literature provided by different researchers
  9. Keywords:
  10. Cone Penetration Test ; Undraind Clay Soil ; Numerical Modeling ; In-Situ Horizontal (Effective)Stress ; Finite Difference Method ; Lateral Earth Pressure Coefficient ; Saturated Soil

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