Model studies of plus and double box shaped skirted footings resting on sand

• Main Authors: Tammineni Gnananandarao, Rakesh Kumar Dutta, Vishwas Nandkishor Khatri
• Format: Article
• Language: English
• Published: SpringerOpen 2020-02-01
• Series: International Journal of Geo-Engineering
• Subjects: Plus and double box skirted footing; Sand; Bearing capacity; Interface condition; Relative density; Settlement
• Online Access: https://doi.org/10.1186/s40703-020-00109-0

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 (D s ) 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 D s /B = 0.25 was 26.08% at a relative density of 60%, whereas the highest improvement for the double box shaped footing with D s /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.