Abstract
The paper presents the investigation on the model unskirted/skirted footings (plus and the double box) on sand. Skirt depth, sand relative density, footing interface condition and skirted footing type were varied parameters. Skirt depth (Ds) varied in this investigation was from 0.25 B to 1.5 B (B, footing width). The results show that the footing geometry and the skirt increased the bearing capacity and improved the overall behaviour. The results further revealed that the lowest percentage improvement for the square shaped footing with Ds/B = 0.25 was 26.08% at a relative density of 60%, whereas the highest improvement for the double box shaped footing with Ds/B = 1.50 was 364.12% at a relative density of 30%. The settlement reduction factors with the use of skirt from this investigation ranged from 0.16 to 1.0 and depended on the pressure applied and the depth ratio of the skirt. Finally, for the settlement reduction factor, an empirical equation was developed. This expression can be used to calculate the settlement of the plus and double box shaped skirted footings on sand.
Highlights
Civil engineers are always looking for innovative techniques for reducing the settlement and improving the bearing capacity of the subsoil
The study reported by Al-Aghbari and Mohamedzein [3] and El Wakil [4] concluded that the addition of skirt to shallow foundation can be considered as an alternative technique for improving the bearing capacity and reduction of settlement
It is appropriate to mention here that the bearing capacity corresponding to the peak pressure is taken if the clear peak was observed in the curve
Summary
Civil engineers are always looking for innovative techniques for reducing the settlement and improving the bearing capacity of the subsoil. The unskirted/skirted model plus and double box shaped footings were used in the present work to study their behaviour through laboratory tests Such unconventional geometry in certain cases is Gnananandarao et al Geo-Engineering (2020) 11:2 required for static, economical and architectural reasons. The study reported by Al-Aghbari and Mohamedzein [3] and El Wakil [4] concluded that the addition of skirt to shallow foundation can be considered as an alternative technique for improving the bearing capacity and reduction of settlement. By means of small-scale laboratory model studies, Mahmood et al [19] extended the use of circular skirted footing in submerged gypseous soil and reported an improvement in the bearing capacity in the range of 1.92 to 2.27. The use of uncertain geometry (plus and double box shape) of the skirted footings with a vertical concentric load has not been studied yet in the literature
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