NUMERICAL ANALYSIS OF AXIAL LOADED LARGE DIAMETER PILE IN DENSE SAND (CASE STUDY FROM CAIRO MONORAIL)
Volume Title: ICASGE2025
Paper ID : 1023-ICASGE (R1)
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Abstract
Large diameter piles are designed to achieve ultimate pile capacity and the pile settlement at failure. The ultimate pile capacity is the sum of the ultimate shaft load and the ultimate base load. According to ECP, the in-situ loading test are considered the most reliable in terms of the load-settlement relationship. Practically it is noticed that the in-situ loading test for large diameter piles are far from the design outputs. In present study, numerical models were carried out to provide the behavior of large diameter piles in dense sand to achieve the optimum load-settlement relationship for both numerical and in-situ loading test. Numerical modeling was performed for two piles of diameters having 1.2m and 2.4m and five lengths range from 12m to 60m. The results of the numerical models were noticed to be a linear relationship between the ratio of pile length to pile diameter (L/D) and the ultimate shaft load. The ultimate pile capacities were calculated from the modified Chin method. Therefore, the ultimate base resistance was calculated and plotted as a relationship with (L/D). The corresponding settlement for both ultimate shaft load and ultimate base load are determined and plotted. The results were compared with two cases of the in-situ loading tests carried at the Cairo Monorail project of the same site soil condition. The results were closed to that obtained from numerical output. Finally, proposed equations through a plotted figures are drawn to predict the ultimate load capacity of large diameter pile.
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