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<p>The present study highlights the numerical investigations on the effect of silt interlayers in the response of loose saturated sandy soil deposits. The loose sand deposit and non-plastic silt layers are modelled using effective stress-based elastoplastic UBC3D-PLM and critical state-based PM4Sand model, respectively. The plastic silt layers are modelled using the critical state-based advanced PM4Silt constitutive model. For a wide range of silt layer properties, silt layer position along the depth of the sand deposit and layer thickness are varied. All the models are subjected to 0.1<i>&#xa0;g</i> cyclic loading amplitude with 1.0&#xa0;Hz frequency. A considerable reduction in excess pore pressure occurs below and above the silt layer due to the presence of a plastic silt interlayer. However, localized excess pore pressure accumulation was observed in the low-plastic silt layer, which approaches the excess pore pressure of the homogeneous sand deposit. With the increase in the thickness of low-plastic silt interlayer from 0.8&#xa0;m to 1.6&#xa0;m, around 40% reduction is observed in the excess pore pressure above and below the silt layer. However, a further increase in the silt layer thickness has a marginal effect.</p>

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Dynamic Behaviour of Plastic and Non-plastic Silt Interlayered Liquefiable Deposit

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Abhijit Chakraborty,
  • Vishwas A. Sawant

摘要

The present study highlights the numerical investigations on the effect of silt interlayers in the response of loose saturated sandy soil deposits. The loose sand deposit and non-plastic silt layers are modelled using effective stress-based elastoplastic UBC3D-PLM and critical state-based PM4Sand model, respectively. The plastic silt layers are modelled using the critical state-based advanced PM4Silt constitutive model. For a wide range of silt layer properties, silt layer position along the depth of the sand deposit and layer thickness are varied. All the models are subjected to 0.1 g cyclic loading amplitude with 1.0 Hz frequency. A considerable reduction in excess pore pressure occurs below and above the silt layer due to the presence of a plastic silt interlayer. However, localized excess pore pressure accumulation was observed in the low-plastic silt layer, which approaches the excess pore pressure of the homogeneous sand deposit. With the increase in the thickness of low-plastic silt interlayer from 0.8 m to 1.6 m, around 40% reduction is observed in the excess pore pressure above and below the silt layer. However, a further increase in the silt layer thickness has a marginal effect.