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Numerical Study of Bearing Capacity of Strip and Circular Foundations on Two-layer Soil with Sand on Clay

Ghaderi, Sina | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52327 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadi, Mohammad Mahdi
  7. Abstract:
  8. Determination of soil bearing capacity has been a subject for both geotechnical engineers and designers for a long time and a variety of relationships have been proposed to determine the ultimate bearing capacity of homogeneous soils. One of the most primitive equations in bearing capacity of foundations, which was Based on prandtl's (1920) bearing capacity, with some modifications, was proposed by Terzaghi. In many lands, the soft clay layer Located in a low depth of subsurface soil profile. Either the foundation should be laid in greater depth on the stiff clay or a layer of compacted sand can be used to improve the ultimate bearing capacity. Most of the recent works, which have done so far on bearing capacity has been for homogeneous soils but in reality the soil profile is not homogeneous and consists of several layers. In this study, Flac2d software was used to determine the ultimate bearing capacity of strip and circular foundations located in sand layer on clay by using finite difference method. It is common practice that the results for the bearing capacity of foundations have been determined with an associated flow rule assumptions. However, the angle of dilation in most soils is usually much lower than their friction angle. In fact, the non-associated flow rule governs the soil’s actual behavior, Therefore, it is necessary to pay attention to the effect of this in the analysis of the bearing capacity. This study also assumes that soils comply with the non-associated flow rule. In this research, the parameters affecting the ultimate bearing capacity of strip and circular foundations are investigated by using finite difference method. According to the results of this research, practical relationships are presented to determine the ultimate bearing capacity of strip and circular foundations on sandy soil on clay
  9. Keywords:
  10. Ultimate Bearing Capacity ; Two-Layered Soil ; Strip Theory ; Circular Foundaction ; Numerical Modeling ; FLAC Software ; Nonassociative Fluids

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