<p>Compressibility and hydraulic conductivity parameters are key parameters for reliable deformation calculations under civil engineering structures in soft soils. However, accurate evaluation of these parameters can be a challenging task in heterogeneous soil deposits in the recent plio-quaternary deposits in Bouregreg Valley Morocco. In this regard, site-specific empirical correlations were developed based on a significant number of piezocones data (CPTU’s). This paper aims at investigating the produced empirical correlation ability to estimate the primary compression index <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40891_2025_633_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="20" /> </InlineMediaObject> <EquationSource Format="TEX">${C}_{c}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>C</mi> <mi>c</mi> </msub> </math></EquationSource> </InlineEquation> and the secondary compression index C<sub>α</sub> based on the corrected cone resistance <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40891_2025_633_Article_IEq2.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="16" /> </InlineMediaObject> <EquationSource Format="TEX">${q}_{t}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>q</mi> <mi>t</mi> </msub> </math></EquationSource> </InlineEquation>, and the normalized cone resistance <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40891_2025_633_Article_IEq3.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="29" /> </InlineMediaObject> <EquationSource Format="TEX">${Q}_{tn}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>Q</mi> <mrow> <mi mathvariant="italic">tn</mi> </mrow> </msub> </math></EquationSource> </InlineEquation>. In addition, the soil hydraulic conductivity is calculated by using a direct approach from literature based on piezocone data. For validation, numerical predictions are compared with field measurements taken from a road embankment. Results showed an improved vertical and lateral deformation prediction when using the normalized cone resistance. For that, it’s been concluded that when adopting the proposed framework, the parameter selection procedure was enhanced, benefiting from the continuous piezocone measurement profiles.</p>

Compressibility and Hydraulic Conductivity Evaluation Based on CPTU Test, Bouregreg Valley, Morocco

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发表日期：

2025年4月28日

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Ahmed Hamza Mridakh,
Fouad Lahlou,
Houssine Ejjaaouani,
Hassan Labied

摘要

Compressibility and hydraulic conductivity parameters are key parameters for reliable deformation calculations under civil engineering structures in soft soils. However, accurate evaluation of these parameters can be a challenging task in heterogeneous soil deposits in the recent plio-quaternary deposits in Bouregreg Valley Morocco. In this regard, site-specific empirical correlations were developed based on a significant number of piezocones data (CPTU’s). This paper aims at investigating the produced empirical correlation ability to estimate the primary compression index ${C}_{c}$ $C_{c}$ and the secondary compression index C_α based on the corrected cone resistance ${q}_{t}$ $q_{t}$ , and the normalized cone resistance ${Q}_{tn}$ $Q_{tn}$ . In addition, the soil hydraulic conductivity is calculated by using a direct approach from literature based on piezocone data. For validation, numerical predictions are compared with field measurements taken from a road embankment. Results showed an improved vertical and lateral deformation prediction when using the normalized cone resistance. For that, it’s been concluded that when adopting the proposed framework, the parameter selection procedure was enhanced, benefiting from the continuous piezocone measurement profiles.