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<p>This article presents an automatic calibration of soil model parameters from the pressuremeter test (PMT) curves using an inverse analysis. The process is carried out by integrating UCODE, a versatile inverse modeling tool, with the finite element (FE) software PLAXIS. A 2-D axisymmetric FE model is built to simulate the field PMT and obtain the stress–strain curves. UCODE can adjust the model parameters to their optimized values by minimizing the discrepancies between the simulated stress–strain curve and the field test one. The hardening soil (HS) model, known for its ability to capture the stress–strain behavior of soils, is selected to simulate the soil behaviour while performing the PMT. In this study, a total of eight HS model parameters are calibrated for two popular Toronto sand types: Sand and Silty Sand. The calibration process is automatically conducted using Macros, ensuring efficiency and accuracy. The calibrated parameters for <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10706_2025_3341_Article_IEq1.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">\(v_{{_{{ur}} }}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mi>v</mi> <mmultiscripts> <mrow /> <mrow> <mi mathvariant="italic">ur</mi> </mrow> <mrow /> </mmultiscripts> <mrow /> </mmultiscripts> </math></EquationSource> </InlineEquation> and R<sub>f</sub> are aligned with literature values. In contrast, the modulus parameters and friction angle are higher, reflecting the very dense nature of Toronto's glacial sandy soil samples investigated in this study. Due to the limited sample size and low variations of their index properties, caution is advised when applying these calibrated values. Nevertheless, the findings offer a valuable reference for local geotechnical practice.</p>

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Inverse Analysis of Pressuremeter Tests by Calibrating Soil Parameters for Toronto Sands

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Muhammad Salman Babar,
  • Jinyuan Liu

摘要

This article presents an automatic calibration of soil model parameters from the pressuremeter test (PMT) curves using an inverse analysis. The process is carried out by integrating UCODE, a versatile inverse modeling tool, with the finite element (FE) software PLAXIS. A 2-D axisymmetric FE model is built to simulate the field PMT and obtain the stress–strain curves. UCODE can adjust the model parameters to their optimized values by minimizing the discrepancies between the simulated stress–strain curve and the field test one. The hardening soil (HS) model, known for its ability to capture the stress–strain behavior of soils, is selected to simulate the soil behaviour while performing the PMT. In this study, a total of eight HS model parameters are calibrated for two popular Toronto sand types: Sand and Silty Sand. The calibration process is automatically conducted using Macros, ensuring efficiency and accuracy. The calibrated parameters for \(v_{{_{{ur}} }}\) v ur and Rf are aligned with literature values. In contrast, the modulus parameters and friction angle are higher, reflecting the very dense nature of Toronto's glacial sandy soil samples investigated in this study. Due to the limited sample size and low variations of their index properties, caution is advised when applying these calibrated values. Nevertheless, the findings offer a valuable reference for local geotechnical practice.