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Volume Title: ICASGE2023

DOI: ICASGE-GEO

Ibrahim S Harran ; Ahmed M. Nasr; Waseim R. Azzam; Ibrahim S. Harran; Ahmed M. Nasr; Waseim Ragab Azzam

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

Recently, the use of deep foundations has increased as a result of the expansion in the construction of high-rise buildings, train tracks, and port berths. As a result of this expansion, it was necessary to use deep foundations that have low cost, high bearing loads, low settlement, low construction time, and are subjected to different types of loads such as lateral, vertical compression, and tension loads. This research paper will present one of the most important types of deep foundations that are aptly used in such structures and the most important factors affecting their bearing capacity, settlement, and failure mechanisms that occur with this type of foundation, and also study these factors in two types of clay soil (medium and stiff). This type of deep foundation is called an under-reamed pile, and the factors affecting the bearing load are such as bulb diameter, number, and spacing. To investigate the effects of these parameters and obtain optimal results, the PLAXIS 3D was used. The analysis shows that, the increase in bulb diameter has a great effect on the bearing load. Bulb spacing controls the failure mechanisms, whether cylindrical shear failure or individual failure. When the number of bulbs increases, the bearing capacity doubles, especially if each bulb works individually.

Under-reamed pile; bulb number; bulb diameter; bulb spacing; bearing capacity

Geotechnical Engineering (GEO)