Most early studies on estimating shallow foundations’ bearing capacity and settlement characteristics are for dry or low near-to-the-ground moisture-content soils. Practically, the state of saturation becomes the worst-case scenario to estimate the bearing capacity of the foundations. Furthermore, the challenge of dealing with the interference between two adjacent footings has been mostly attributed to the scarcity of appropriate construction sites. Consequently, engineers frequently encounter the need to position footings in close proximity, leading to alterations in the ultimate bearing capacity (UBC) and settlement, as influenced by the chosen spacing. The primary objective of this study is to assess the bearing capacity of strip footings that are put in close proximity on a saturated foundation media. This will be achieved by utilizing a numerical technique, specifically the finite element method, with the use of a commercially available software program known as ABAQUS. The soil is described using the Mohr–Coulomb material model in order to conduct a coupled pore fluid stress analysis, with the assumption that the water table is located at the ground level. The observed interference effect seen in the dry soil has a notable similarity to that reported in the existing literature. Additionally, the saturation level exerts a notable influence on the interference experienced by the bearing capacity, resulting in a large drop for the spacing of major interference. It is found that the drop in the UBC due to saturation for the closely spaced footings are 60%, 59%, 57%, and 55%, respectively, for the spacing 0.5, 0.75, 1.0, and 1.5 times the width of the footing.

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Numerical Investigation of Strip Footing Interference on Saturated Foundation Medium

  • Anupkumar G. Ekbote,
  • M. S. Deepak,
  • Chandrashekharappa Agasnalli

摘要

Most early studies on estimating shallow foundations’ bearing capacity and settlement characteristics are for dry or low near-to-the-ground moisture-content soils. Practically, the state of saturation becomes the worst-case scenario to estimate the bearing capacity of the foundations. Furthermore, the challenge of dealing with the interference between two adjacent footings has been mostly attributed to the scarcity of appropriate construction sites. Consequently, engineers frequently encounter the need to position footings in close proximity, leading to alterations in the ultimate bearing capacity (UBC) and settlement, as influenced by the chosen spacing. The primary objective of this study is to assess the bearing capacity of strip footings that are put in close proximity on a saturated foundation media. This will be achieved by utilizing a numerical technique, specifically the finite element method, with the use of a commercially available software program known as ABAQUS. The soil is described using the Mohr–Coulomb material model in order to conduct a coupled pore fluid stress analysis, with the assumption that the water table is located at the ground level. The observed interference effect seen in the dry soil has a notable similarity to that reported in the existing literature. Additionally, the saturation level exerts a notable influence on the interference experienced by the bearing capacity, resulting in a large drop for the spacing of major interference. It is found that the drop in the UBC due to saturation for the closely spaced footings are 60%, 59%, 57%, and 55%, respectively, for the spacing 0.5, 0.75, 1.0, and 1.5 times the width of the footing.