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Interference of Surface and Embedded Three Strip Footings in Undrained Condition

Abstract

The closed-form solutions for the undrained bearing capacity of shallow footing have been derived considering only single footing due to difficulties associated with adding the effect of nearby footings. However, the footing, in reality, may be separated or bounded by other footings from one side or two sides, and hence, the interference effect should be considered. This study has been conducted to understand the influence of the presence of existed footings on the undrained bearing capacity of a new footing that is placed between the existed footings. Validated numerical analyses have been conducted for single and interference footings to clearly understand the effect of the spacing between the footings on the obtained bearing capacity and the associated failure mechanism. The influence of the embedment ratio and the undrained cohesion has also been considered in these analyses to illustrate the combined influence of all of the factors. It was found that the undrained cohesion does not remarkably influence the trend of the relationship of the bearing capacity ratio and the distance ratio between the old and the new footings, while the embedment ratio has been found to have a remarkable impact on the trend of the aforementioned relationship. The average maximum percentage increase of the bearing capacity of the new footing due to the interference effect is found to be ranged between 6% to 23% depending on the embedment ratio and the distance between the footings. Importantly, the embedment ratio is found to influence the critical distance at which the maximum bearing capacity of the new footing is achieved.

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Correspondence to Saif Alzabeebee.

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Alzabeebee, S. Interference of Surface and Embedded Three Strip Footings in Undrained Condition. Transp. Infrastruct. Geotech. 9, 250–267 (2022). https://doi.org/10.1007/s40515-021-00172-9

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Keywords

  • Undrained bearing capacity
  • Interference effect
  • Finite element analysis
  • Embedment ratio