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<p>This study proposes empirical correlations between the pressuremeter modulus (<i>E</i><b> &lt; sub &gt; PMT &lt; /sub &gt;</b>), limit pressure (<i>P</i><b> &lt; sub &gt; L &lt; /sub &gt;</b>), and the results of the standard penetration test (<i>N</i><b> &lt; sub &gt; 60 &lt; /sub &gt;</b>) for heterogeneous soils of the Saharan region of Algeria. A comprehensive geotechnical investigation campaign was conducted, including 46 SPT tests and 46 pressuremeter tests (PMT) carried out at different depths, mainly targeting gypsum sandy loams and carbonate crust formations. The obtained data were processed using linear regression, selected for its ability to reveal clear first-order trends while maintaining model simplicity and ease of interpretation, which are essential in practical geotechnical applications, showing strong correlations with coefficients of determination of 0.673 for <i>E</i><b> &lt; sub &gt; PMT &lt; /sub &gt; </b>and 0.646 for <i>P</i><b> &lt; sub &gt; L &lt; /sub &gt; </b>. The results highlight the exceptional mechanical behavior of these soils, with <i>E</i><b> &lt; sub &gt; PMT &lt; /sub &gt; </b>values ranging from 45 to 748&#xa0;MPa and <i>P</i><b> &lt; sub &gt; L &lt; /sub &gt; </b>values between 1.41 and 52.74&#xa0;MPa, significantly higher than the ranges usually reported in the literature for other soil types. Comparative analysis with existing models highlights the particular rigidity and cementation of Saharan soils, justifying the development of correlations specific to this geological context. Statistical validation confirms the robustness of the proposed equations, supported by high Fisher (F) test values and low dispersion (RMSE: 41.17&#xa0;MPa for <i>E</i><b> &lt; sub &gt; PMT &lt; /sub &gt; </b>; 4.38&#xa0;MPa for <i>P</i><b> &lt; sub &gt; L &lt; /sub &gt;</b>). This research fills an important gap in the geotechnical literature by providing reliable and locally adapted empirical models for the estimation of pressuremeter parameters from <i>N</i><b> &lt; sub &gt; 60 &lt; /sub &gt; </b>data in arid environments. The results obtained offer practical tools for infrastructure design in similar geological environments, while improving the cost-effectiveness and accuracy of geotechnical studies.</p>

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SPT-Based Empirical Correlations for Pressuremeter Modulus and Limit Pressure for Heterogeneous Saharan soil of Algeria

  • 期刊论文

  • 发表日期：

    2025年9月29日

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  • Yacine Mohamed Daksi,
  • Zakaria Matougui,
  • Mehdi Dib,
  • Zidane abderraouf Benmohammed

摘要

This study proposes empirical correlations between the pressuremeter modulus (E < sub > PMT < /sub >), limit pressure (P < sub > L < /sub >), and the results of the standard penetration test (N < sub > 60 < /sub >) for heterogeneous soils of the Saharan region of Algeria. A comprehensive geotechnical investigation campaign was conducted, including 46 SPT tests and 46 pressuremeter tests (PMT) carried out at different depths, mainly targeting gypsum sandy loams and carbonate crust formations. The obtained data were processed using linear regression, selected for its ability to reveal clear first-order trends while maintaining model simplicity and ease of interpretation, which are essential in practical geotechnical applications, showing strong correlations with coefficients of determination of 0.673 for E < sub > PMT < /sub > and 0.646 for P < sub > L < /sub > . The results highlight the exceptional mechanical behavior of these soils, with E < sub > PMT < /sub > values ranging from 45 to 748 MPa and P < sub > L < /sub > values between 1.41 and 52.74 MPa, significantly higher than the ranges usually reported in the literature for other soil types. Comparative analysis with existing models highlights the particular rigidity and cementation of Saharan soils, justifying the development of correlations specific to this geological context. Statistical validation confirms the robustness of the proposed equations, supported by high Fisher (F) test values and low dispersion (RMSE: 41.17 MPa for E < sub > PMT < /sub > ; 4.38 MPa for P < sub > L < /sub >). This research fills an important gap in the geotechnical literature by providing reliable and locally adapted empirical models for the estimation of pressuremeter parameters from N < sub > 60 < /sub > data in arid environments. The results obtained offer practical tools for infrastructure design in similar geological environments, while improving the cost-effectiveness and accuracy of geotechnical studies.