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<p>The location of loads that are applied to strip footings can be located vertically in the center or outside of center. Also, the footing of structures may be placed on three-layered soils where the middle layer is a weak thin layer that there are not many studies in this field and their behavior is still unknown. The effects of a weak thin layer between two layers of sand under the influence of central and eccentric concentrated loads on the strip footings have been investigated in the form of experimental and numerical studies in this research. The laboratory study with small-scale models and numerical modeling with FEM program PLAXIS in small and large scales have been done. The results of experimental and numerical models indicate the significant effect of weak layer and eccentric loading in reducing the bearing capacity and increasing the settlements of the strip footings. According to the results, the greatest reduction in ultimate bearing capacity is occurred when the weak thin layer at the critical depth of 1B and load eccentricity equal to 0.083B and the thickness of weak thin layer equal to 0.2B to the extent of 45% (from 94.81 to 52.17&#xa0;kPa).</p>

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Effect of Eccentric Loadings on the Bearing Capacity of Strip Footing Located on Multi-Layered Soil Mass with a Weak Layer: An Experimental and Numerical Study

  • 期刊论文

  • 发表日期：

    2025年9月20日

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  • Javad Sadeghi,
  • Ahad Bagherzadeh Khalkhali,
  • Javad Nazariafshar,
  • Navid Ganjian

摘要

The location of loads that are applied to strip footings can be located vertically in the center or outside of center. Also, the footing of structures may be placed on three-layered soils where the middle layer is a weak thin layer that there are not many studies in this field and their behavior is still unknown. The effects of a weak thin layer between two layers of sand under the influence of central and eccentric concentrated loads on the strip footings have been investigated in the form of experimental and numerical studies in this research. The laboratory study with small-scale models and numerical modeling with FEM program PLAXIS in small and large scales have been done. The results of experimental and numerical models indicate the significant effect of weak layer and eccentric loading in reducing the bearing capacity and increasing the settlements of the strip footings. According to the results, the greatest reduction in ultimate bearing capacity is occurred when the weak thin layer at the critical depth of 1B and load eccentricity equal to 0.083B and the thickness of weak thin layer equal to 0.2B to the extent of 45% (from 94.81 to 52.17 kPa).