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<p>The undrained shear strength, <i>S</i><sub><i>u</i></sub> is one of the key parameters required to assess the short-term stability analysis of various geotechnical infrastructures which are typically measured using the vane shear test (VST) results. The remolded <i>S</i><sub><i>u</i></sub> obtained from VST is also used to evaluate soil sensitivity, and <i>S</i><sub><i>t</i></sub> that represents the loss of <i>S</i><sub><i>u</i></sub> upon remolding. Sensitivity is a critical factor in assessing the risk of slope failure in sensitive clays. In the present study, <i>S</i><sub><i>u</i></sub> and index properties of sensitive Champlain Sea Clay (CSC) deposits were compiled across the Ottawa Valley in Eastern Ontario. The gathered information is assembled into a database and statistically evaluated, with particular emphasis on the variability of <i>S</i><sub><i>u</i></sub> derived from VST results as they are inherently prone to operator bias and environmental effects. For this reason, mean and standard deviation values, and corresponding coefficients of variation (COV) of <i>S</i><sub><i>u</i></sub> were also established that serve as benchmarks for detecting major testing errors or misinterpretations. In addition, a numerical exercise was conducted to evaluate the coefficient of determination, <i>R</i><sup><i>2</i></sup> between the components of the sample data to investigate the potential for establishing correlations between <i>S</i><sub><i>u</i></sub> and other soil parameters to aid further characterization. The results presented in this study are also useful for extending them in probabilistic analyses, including Random Field based modeling for making rational decisions in geotechnical engineering practice that are challenging.</p>

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Spatial Variability of Undrained Shear Strength in Champlain Sea Clay in the Ottawa Region

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • N’eem Tavakkoli,
  • Yao Li,
  • Won Taek Oh,
  • Sai K. Vanapalli

摘要

The undrained shear strength, Su is one of the key parameters required to assess the short-term stability analysis of various geotechnical infrastructures which are typically measured using the vane shear test (VST) results. The remolded Su obtained from VST is also used to evaluate soil sensitivity, and St that represents the loss of Su upon remolding. Sensitivity is a critical factor in assessing the risk of slope failure in sensitive clays. In the present study, Su and index properties of sensitive Champlain Sea Clay (CSC) deposits were compiled across the Ottawa Valley in Eastern Ontario. The gathered information is assembled into a database and statistically evaluated, with particular emphasis on the variability of Su derived from VST results as they are inherently prone to operator bias and environmental effects. For this reason, mean and standard deviation values, and corresponding coefficients of variation (COV) of Su were also established that serve as benchmarks for detecting major testing errors or misinterpretations. In addition, a numerical exercise was conducted to evaluate the coefficient of determination, R2 between the components of the sample data to investigate the potential for establishing correlations between Su and other soil parameters to aid further characterization. The results presented in this study are also useful for extending them in probabilistic analyses, including Random Field based modeling for making rational decisions in geotechnical engineering practice that are challenging.