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Determination of Lateral Pressure of Sandy Soil Using Results of Calibration of Cone Penetration Test

Karambakhsh, Pooya | 2008

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39147 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadi, Mohammad Mehdi
  7. Abstract:
  8. Cone Penetration Test (CPT) is one of the major in-situ tests used around the world. Obtaining undisturbed samples from sands is generally very difficult and expensive, and in some cases impractical. A good interpretation of CPT results can provide important soil parameters, and therefore the need for undisturbed sampling may be reduced. Using Calibration Chambers, a soil with predefined parameters is tested by cone penetrometer and some relationships are developed between CPT results and soil parameters. Using these relationships, in-situ results are interpreted. CPT results can be used to evaluate different aspects: soil stratification, geoenvironmental characteristics, stress state and soil deformation and strength parameters. Knowing soil stress state is very important to interpret soil condition and predict soil behavior during different situations. Vertical stress can be estimated easily and with good precision. However, determination of horizontal stress is very challenging. Different relationships have been suggested to relate CPT results to coefficient of lateral earth pressure, but so far none of them has been consented by all. In this thesis, after introducing previously developed relationships, some of parameters influencing cone resistance are discussed. To do so, effect of boundary conditions of calibration chamber tests, chamber to cone diameter ratio, soil relative density, overconsolidation ratio, state parameter, internal friction angle, dilation angle, vertical and horizontal stress are discussed using calibration chamber tests results gathered from different calibration chambers around the world. It will be shown that horizontal stress is more dominant than vertical stress in CPT results. Therefore, using the relationship between cone resistance and soil parameters including horizontal stress, a relationship between coefficient of lateral earth pressure and cone resistance is proposed. Finally, using calibration chamber test results, this relationship is verified and compared to other available relationships.
  9. Keywords:
  10. Sands ; Cone Penetration Test ; Calibration Chamber ; Lateral Earth Pressure Coefficient

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