Scholarlink

<p>Brasilia porous clay exhibits a metastable structure with a high collapse potential, characterized by abrupt deformations induced by wetting or loading. Traditional constitutive models often fail to realistically capture this behavior. This study adopts a modified version of the Barcelona Basic Model, incorporating key improvements such as the effective stress formulation proposed by Bishop with variable saturation, suction-dependent strength parameters, and Lode angle dependency. These features enhance the model’s ability to simulate unsaturated conditions and collapse behavior. The model was implemented in PLAXIS 2D using the User-Defined Soil Model (UDSM) interface. Parameters were calibrated and validated through numerical simulations of triaxial and oedometer tests under both saturated and unsaturated conditions. Statistical indicators (RMSE, NRMSE, and R<sup>2</sup>) confirmed strong agreement between simulated and experimental results, particularly regarding the soil response to suction variation and wetting-induced collapse. By combining an enhanced theoretical framework with practical numerical implementation, the PLAXIS Barcelona Basic Model (PBBM) offers a robust and accessible tool for geotechnical analysis of collapsible tropical soils. These findings contribute to a better understanding of the hydro-mechanical behavior of Brasilia porous clay and provide a reference for predicting deformations in similar materials under engineering conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Hydromechanical Modeling of Collapsible Unsaturated Soils Using an Extended Barcelona Basic Model

  • 期刊论文

  • 发表日期：

    2025年8月22日

查看全文
  • Emerson Batista Silva,
  • Rafael Cerqueira Silva

摘要

Brasilia porous clay exhibits a metastable structure with a high collapse potential, characterized by abrupt deformations induced by wetting or loading. Traditional constitutive models often fail to realistically capture this behavior. This study adopts a modified version of the Barcelona Basic Model, incorporating key improvements such as the effective stress formulation proposed by Bishop with variable saturation, suction-dependent strength parameters, and Lode angle dependency. These features enhance the model’s ability to simulate unsaturated conditions and collapse behavior. The model was implemented in PLAXIS 2D using the User-Defined Soil Model (UDSM) interface. Parameters were calibrated and validated through numerical simulations of triaxial and oedometer tests under both saturated and unsaturated conditions. Statistical indicators (RMSE, NRMSE, and R2) confirmed strong agreement between simulated and experimental results, particularly regarding the soil response to suction variation and wetting-induced collapse. By combining an enhanced theoretical framework with practical numerical implementation, the PLAXIS Barcelona Basic Model (PBBM) offers a robust and accessible tool for geotechnical analysis of collapsible tropical soils. These findings contribute to a better understanding of the hydro-mechanical behavior of Brasilia porous clay and provide a reference for predicting deformations in similar materials under engineering conditions.