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Volume Title: ICASGE2023

DOI: ICASGE-GEO

¹Ahmed Abdelgwad Ahmed ; ²Ahmed M. Nasr; ³Waseim Ragab Azzam; Ahmed Abdelgwad Ahmed; Ahmed M. Nasr; Waseim Ragab Azzam

¹Delta Higher Institute for Engineering and Technology

²Structural department, faculty of engineering, Tanta university, Tanta, Egypt.

³Professor of Geotechnical Engineering,Faculty of Engineering,Tanta University

Numerous tall structures, such as marine dolphins, high-rise platforms, transmission towers, dock fendering systems, and abutments, are constructed on deep foundations in order to withstand considerable uplift loads. The behavior of single enlarged base piles when they are subjected to vertical forces in sand has been investigated by a large number of researchers using both experimental and numerical methods. Remarkably, the uplift response of group enlarged base piles imbedded in sand that were subjected to uplift loads was never completely examined. Neither was the uplift group efficiency of these piles. In this study, the findings of tests conducted on enlarged base pile groups consisted of two, three, and four piles embedded in sandy soil with different spacing between piles (Sp/Db) of (3, 4 and 5) are analyzed and discussed. It is concluded that, as sand relative density increased, group efficiency decreased. Increasing of Pile spacing and number of piles in the group improve group efficiency. the efficiency of the examined enlarged base pile groups with pile spacing of three times base diameters (Sp/Db=3) constructed in medium sand was determined to be 90% for the group with two piles, 75% for the group with three piles, and 64% for the group with four piles, respectively. However, when the same groups were tested in dense sand, the efficiency values were found to be lowered to 66, 52, and 47% for the group of 2, 3, and 4 piles, respectively.

group of Enlarged base piles –Uplift loads – Sand relative density – Group efficiency

Geotechnical Engineering (GEO)