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Correlation of In-Situ Horizontal Stress and Cone Tip Resistance in Sandy Soils Using Calibration Chamber Test Measurements

Alikahi, Mohammad Hossein | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54171 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadi, Mohammad Mehdi
  7. Abstract:
  8. This study aims to propose a new correlation between in-situ horizontal stress and cone tip resistance in soils. Knowing the field in-situ stress state condition has an important role in stability assessment and stress-deformation analysis in a common geotechnical system. Although vertical stress could be measured easily, horizontal stress is still known as challenging work. Due to the difficulty in sampling undisturbed sand specimens, in-situ tests have been proposed in the previous literature to investigate the different characteristics of this soil. Cone Penetration Test (CPT) is one of the most used and accepted soil methods for soil investigation, identifying different soil parameters such as stratification, geoenvironmental condition, stress state, deformation, strength parameters, and soil type. Calibration Chamber is one of the methods commonly used for modeling and interpreting the CPT experimental results. Using Calibration Chambers, a soil with predefined parameters should be used to conduct a CPT test. Based on the obtained result from the CPT test and compared them to the predefined soil parameter, a new correlation could be estimated that can be used for future interpretation of in-situ test results. One of the most critical parameters for interpreting soil behavior and soil condition is over consolidation ratio (OCR), indicating soil stress history. Due to the high importance of OCR in different soil characteristics and the existing challenge regarding investigating this parameter in sandy soils, this study focuses on this topic. Therefore, in this research, a new correlation with an emphasis on OCR will be proposed ultimately.
    In this research, after evaluating previously established correlations, a new correlation for the in-situ horizontal stress and cone tip resistance will be proposed, using Calibration Chamber experimental data collected from the different countries. Using ABAQUS software, a new simulation of the CPT and field condition will be presented in the following step. Consequently, the proposed correlation will be compared with some other existing correlations, and its validity investigated thoroughly
  9. Keywords:
  10. Cone Penetration Test ; Numerical Modeling ; Sands ; Over Consolidation Ratio (OCR) ; Lateral Earth Pressure ; Calibration Chamber

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